diff --git a/.gitignore b/.gitignore
index 31dd5005..6e68be50 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,5 @@ pkg/*
 .rbenv-version
 .ruby-gemset
 .ruby-version
+# Appraisal generated lockfiles
+*.gemfile.lock
diff --git a/.travis.yml b/.travis.yml
index 80504a71..0cd2395c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,10 @@
 language: ruby
+# Explicit usage of containerized builds, should provide faster feedback
+# see https://docs.travis-ci.com/user/workers/container-based-infrastructure/
+# and https://docs.travis-ci.com/user/ci-environment/#Virtualization-environments
+sudo: false
+before_install:
+  - gem update bundler
 rvm:
   - 1.9.3
   - 2.0.0
diff --git a/Appraisals b/Appraisals
index f49b3d0a..21fd4311 100644
--- a/Appraisals
+++ b/Appraisals
@@ -1,11 +1,11 @@
 appraise "rails-3-2" do
-  gem "activerecord", "3.2.21"
+  gem "activerecord", "~> 3.2.21"
 end
 
 appraise "rails-4-1" do
-  gem "activerecord", "4.1.10"
+  gem "activerecord", "~> 4.1.10"
 end
 
 appraise "rails-4-2" do
-  gem "activerecord", "4.2.1"
+  gem "activerecord", "~> 4.2.1"
 end
diff --git a/Gemfile b/Gemfile
index 924b5469..f4bbb6f9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -18,5 +18,5 @@ gem "appraisal"
 gem "github_changelog_generator"
 
 group :test do
-	gem "minitest"
+	gem "minitest", "~> 5.0"
 end
diff --git a/gemfiles/rails_3_2.gemfile b/gemfiles/rails_3_2.gemfile
index e13455c5..09b3379c 100644
--- a/gemfiles/rails_3_2.gemfile
+++ b/gemfiles/rails_3_2.gemfile
@@ -6,10 +6,11 @@ gem "sqlite3", :platforms => [:ruby]
 gem "activerecord-jdbcsqlite3-adapter", :platforms => [:jruby]
 gem "rake"
 gem "appraisal"
-gem "activerecord", "3.2.21"
+gem "github_changelog_generator"
+gem "activerecord", "~> 3.2.21"
 
 group :test do
-  gem "minitest"
+  gem "minitest", "~> 5.0"
 end
 
 platforms :rbx do
diff --git a/gemfiles/rails_3_2.gemfile.lock b/gemfiles/rails_3_2.gemfile.lock
deleted file mode 100644
index 4ed54fa7..00000000
--- a/gemfiles/rails_3_2.gemfile.lock
+++ /dev/null
@@ -1,258 +0,0 @@
-PATH
-  remote: ../
-  specs:
-    acts_as_list (0.7.2)
-      activerecord (>= 3.0)
-
-GEM
-  remote: http://rubygems.org/
-  specs:
-    activemodel (3.2.21)
-      activesupport (= 3.2.21)
-      builder (~> 3.0.0)
-    activerecord (3.2.21)
-      activemodel (= 3.2.21)
-      activesupport (= 3.2.21)
-      arel (~> 3.0.2)
-      tzinfo (~> 0.3.29)
-    activesupport (3.2.21)
-      i18n (~> 0.6, >= 0.6.4)
-      multi_json (~> 1.0)
-    appraisal (1.0.2)
-      bundler
-      rake
-      thor (>= 0.14.0)
-    arel (3.0.3)
-    builder (3.0.4)
-    ffi2-generators (0.1.1)
-    i18n (0.7.0)
-    minitest (5.5.1)
-    multi_json (1.10.1)
-    rake (10.4.2)
-    rubinius-coverage (2.0.3)
-    rubinius-debugger (2.2.1)
-    rubinius-developer_tools (2.0.0)
-      rubinius-coverage (~> 2.0)
-      rubinius-debugger (~> 2.0)
-      rubinius-profiler (~> 2.0)
-    rubinius-profiler (2.0.1)
-    rubysl (2.1.0)
-      rubysl-abbrev (~> 2.0)
-      rubysl-base64 (~> 2.0)
-      rubysl-benchmark (~> 2.0)
-      rubysl-bigdecimal (~> 2.0)
-      rubysl-cgi (~> 2.0)
-      rubysl-cgi-session (~> 2.0)
-      rubysl-cmath (~> 2.0)
-      rubysl-complex (~> 2.0)
-      rubysl-continuation (~> 2.0)
-      rubysl-coverage (~> 2.0)
-      rubysl-csv (~> 2.0)
-      rubysl-curses (~> 2.0)
-      rubysl-date (~> 2.0)
-      rubysl-delegate (~> 2.0)
-      rubysl-digest (~> 2.0)
-      rubysl-drb (~> 2.0)
-      rubysl-e2mmap (~> 2.0)
-      rubysl-english (~> 2.0)
-      rubysl-enumerator (~> 2.0)
-      rubysl-erb (~> 2.0)
-      rubysl-etc (~> 2.0)
-      rubysl-expect (~> 2.0)
-      rubysl-fcntl (~> 2.0)
-      rubysl-fiber (~> 2.0)
-      rubysl-fileutils (~> 2.0)
-      rubysl-find (~> 2.0)
-      rubysl-forwardable (~> 2.0)
-      rubysl-getoptlong (~> 2.0)
-      rubysl-gserver (~> 2.0)
-      rubysl-io-console (~> 2.0)
-      rubysl-io-nonblock (~> 2.0)
-      rubysl-io-wait (~> 2.0)
-      rubysl-ipaddr (~> 2.0)
-      rubysl-irb (~> 2.1)
-      rubysl-logger (~> 2.0)
-      rubysl-mathn (~> 2.0)
-      rubysl-matrix (~> 2.0)
-      rubysl-mkmf (~> 2.0)
-      rubysl-monitor (~> 2.0)
-      rubysl-mutex_m (~> 2.0)
-      rubysl-net-ftp (~> 2.0)
-      rubysl-net-http (~> 2.0)
-      rubysl-net-imap (~> 2.0)
-      rubysl-net-pop (~> 2.0)
-      rubysl-net-protocol (~> 2.0)
-      rubysl-net-smtp (~> 2.0)
-      rubysl-net-telnet (~> 2.0)
-      rubysl-nkf (~> 2.0)
-      rubysl-observer (~> 2.0)
-      rubysl-open-uri (~> 2.0)
-      rubysl-open3 (~> 2.0)
-      rubysl-openssl (~> 2.0)
-      rubysl-optparse (~> 2.0)
-      rubysl-ostruct (~> 2.0)
-      rubysl-pathname (~> 2.0)
-      rubysl-prettyprint (~> 2.0)
-      rubysl-prime (~> 2.0)
-      rubysl-profile (~> 2.0)
-      rubysl-profiler (~> 2.0)
-      rubysl-pstore (~> 2.0)
-      rubysl-pty (~> 2.0)
-      rubysl-rational (~> 2.0)
-      rubysl-resolv (~> 2.0)
-      rubysl-rexml (~> 2.0)
-      rubysl-rinda (~> 2.0)
-      rubysl-rss (~> 2.0)
-      rubysl-scanf (~> 2.0)
-      rubysl-securerandom (~> 2.0)
-      rubysl-set (~> 2.0)
-      rubysl-shellwords (~> 2.0)
-      rubysl-singleton (~> 2.0)
-      rubysl-socket (~> 2.0)
-      rubysl-stringio (~> 2.0)
-      rubysl-strscan (~> 2.0)
-      rubysl-sync (~> 2.0)
-      rubysl-syslog (~> 2.0)
-      rubysl-tempfile (~> 2.0)
-      rubysl-thread (~> 2.0)
-      rubysl-thwait (~> 2.0)
-      rubysl-time (~> 2.0)
-      rubysl-timeout (~> 2.0)
-      rubysl-tmpdir (~> 2.0)
-      rubysl-tsort (~> 2.0)
-      rubysl-un (~> 2.0)
-      rubysl-uri (~> 2.0)
-      rubysl-weakref (~> 2.0)
-      rubysl-webrick (~> 2.0)
-      rubysl-xmlrpc (~> 2.0)
-      rubysl-yaml (~> 2.0)
-      rubysl-zlib (~> 2.0)
-    rubysl-abbrev (2.0.4)
-    rubysl-base64 (2.0.0)
-    rubysl-benchmark (2.0.1)
-    rubysl-bigdecimal (2.0.2)
-    rubysl-cgi (2.0.1)
-    rubysl-cgi-session (2.0.1)
-    rubysl-cmath (2.0.0)
-    rubysl-complex (2.0.0)
-    rubysl-continuation (2.0.0)
-    rubysl-coverage (2.0.3)
-    rubysl-csv (2.0.2)
-      rubysl-english (~> 2.0)
-    rubysl-curses (2.0.1)
-    rubysl-date (2.0.9)
-    rubysl-delegate (2.0.1)
-    rubysl-digest (2.0.3)
-    rubysl-drb (2.0.1)
-    rubysl-e2mmap (2.0.0)
-    rubysl-english (2.0.0)
-    rubysl-enumerator (2.0.0)
-    rubysl-erb (2.0.2)
-    rubysl-etc (2.0.3)
-      ffi2-generators (~> 0.1)
-    rubysl-expect (2.0.0)
-    rubysl-fcntl (2.0.4)
-      ffi2-generators (~> 0.1)
-    rubysl-fiber (2.0.0)
-    rubysl-fileutils (2.0.3)
-    rubysl-find (2.0.1)
-    rubysl-forwardable (2.0.1)
-    rubysl-getoptlong (2.0.0)
-    rubysl-gserver (2.0.0)
-      rubysl-socket (~> 2.0)
-      rubysl-thread (~> 2.0)
-    rubysl-io-console (2.0.0)
-    rubysl-io-nonblock (2.0.0)
-    rubysl-io-wait (2.0.0)
-    rubysl-ipaddr (2.0.0)
-    rubysl-irb (2.1.1)
-      rubysl-e2mmap (~> 2.0)
-      rubysl-mathn (~> 2.0)
-      rubysl-thread (~> 2.0)
-    rubysl-logger (2.1.0)
-    rubysl-mathn (2.0.0)
-    rubysl-matrix (2.1.0)
-      rubysl-e2mmap (~> 2.0)
-    rubysl-mkmf (2.0.1)
-      rubysl-fileutils (~> 2.0)
-      rubysl-shellwords (~> 2.0)
-    rubysl-monitor (2.0.0)
-    rubysl-mutex_m (2.0.0)
-    rubysl-net-ftp (2.0.1)
-    rubysl-net-http (2.0.4)
-      rubysl-cgi (~> 2.0)
-      rubysl-erb (~> 2.0)
-      rubysl-singleton (~> 2.0)
-    rubysl-net-imap (2.0.1)
-    rubysl-net-pop (2.0.1)
-    rubysl-net-protocol (2.0.1)
-    rubysl-net-smtp (2.0.1)
-    rubysl-net-telnet (2.0.0)
-    rubysl-nkf (2.0.1)
-    rubysl-observer (2.0.0)
-    rubysl-open-uri (2.0.0)
-    rubysl-open3 (2.0.0)
-    rubysl-openssl (2.2.1)
-    rubysl-optparse (2.0.1)
-      rubysl-shellwords (~> 2.0)
-    rubysl-ostruct (2.0.4)
-    rubysl-pathname (2.1.0)
-    rubysl-prettyprint (2.0.3)
-    rubysl-prime (2.0.1)
-    rubysl-profile (2.0.0)
-    rubysl-profiler (2.0.1)
-    rubysl-pstore (2.0.0)
-    rubysl-pty (2.0.3)
-    rubysl-rational (2.0.1)
-    rubysl-resolv (2.1.2)
-    rubysl-rexml (2.0.4)
-    rubysl-rinda (2.0.1)
-    rubysl-rss (2.0.0)
-    rubysl-scanf (2.0.0)
-    rubysl-securerandom (2.0.0)
-    rubysl-set (2.0.1)
-    rubysl-shellwords (2.0.0)
-    rubysl-singleton (2.0.0)
-    rubysl-socket (2.0.1)
-    rubysl-stringio (2.0.0)
-    rubysl-strscan (2.0.0)
-    rubysl-sync (2.0.0)
-    rubysl-syslog (2.1.0)
-      ffi2-generators (~> 0.1)
-    rubysl-tempfile (2.0.1)
-    rubysl-test-unit (2.0.2)
-      minitest
-    rubysl-thread (2.0.3)
-    rubysl-thwait (2.0.0)
-    rubysl-time (2.0.3)
-    rubysl-timeout (2.0.0)
-    rubysl-tmpdir (2.0.1)
-    rubysl-tsort (2.0.1)
-    rubysl-un (2.0.0)
-      rubysl-fileutils (~> 2.0)
-      rubysl-optparse (~> 2.0)
-    rubysl-uri (2.0.0)
-    rubysl-weakref (2.0.0)
-    rubysl-webrick (2.0.0)
-    rubysl-xmlrpc (2.0.0)
-    rubysl-yaml (2.1.0)
-    rubysl-zlib (2.0.1)
-    sqlite3 (1.3.10)
-    thor (0.19.1)
-    tzinfo (0.3.42)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  activerecord (= 3.2.21)
-  activerecord-jdbcsqlite3-adapter
-  acts_as_list!
-  appraisal
-  bundler (>= 1.0.0)
-  minitest
-  rake
-  rubinius-developer_tools
-  rubysl (~> 2.0)
-  rubysl-test-unit
-  sqlite3
diff --git a/gemfiles/rails_4_1.gemfile b/gemfiles/rails_4_1.gemfile
index 5f59abf5..1550c1e9 100644
--- a/gemfiles/rails_4_1.gemfile
+++ b/gemfiles/rails_4_1.gemfile
@@ -6,10 +6,11 @@ gem "sqlite3", :platforms => [:ruby]
 gem "activerecord-jdbcsqlite3-adapter", :platforms => [:jruby]
 gem "rake"
 gem "appraisal"
-gem "activerecord", "4.1.10"
+gem "github_changelog_generator"
+gem "activerecord", "~> 4.1.10"
 
 group :test do
-  gem "minitest"
+  gem "minitest", "~> 5.0"
 end
 
 platforms :rbx do
diff --git a/gemfiles/rails_4_1.gemfile.lock b/gemfiles/rails_4_1.gemfile.lock
deleted file mode 100644
index 32a0dbba..00000000
--- a/gemfiles/rails_4_1.gemfile.lock
+++ /dev/null
@@ -1,262 +0,0 @@
-PATH
-  remote: ../
-  specs:
-    acts_as_list (0.7.2)
-      activerecord (>= 3.0)
-
-GEM
-  remote: http://rubygems.org/
-  specs:
-    activemodel (4.1.10)
-      activesupport (= 4.1.10)
-      builder (~> 3.1)
-    activerecord (4.1.10)
-      activemodel (= 4.1.10)
-      activesupport (= 4.1.10)
-      arel (~> 5.0.0)
-    activesupport (4.1.10)
-      i18n (~> 0.6, >= 0.6.9)
-      json (~> 1.7, >= 1.7.7)
-      minitest (~> 5.1)
-      thread_safe (~> 0.1)
-      tzinfo (~> 1.1)
-    appraisal (1.0.3)
-      bundler
-      rake
-      thor (>= 0.14.0)
-    arel (5.0.1.20140414130214)
-    builder (3.2.2)
-    ffi2-generators (0.1.1)
-    i18n (0.7.0)
-    json (1.8.2)
-    minitest (5.5.1)
-    rake (10.4.2)
-    rubinius-coverage (2.0.3)
-    rubinius-debugger (2.2.1)
-    rubinius-developer_tools (2.0.0)
-      rubinius-coverage (~> 2.0)
-      rubinius-debugger (~> 2.0)
-      rubinius-profiler (~> 2.0)
-    rubinius-profiler (2.0.1)
-    rubysl (2.1.0)
-      rubysl-abbrev (~> 2.0)
-      rubysl-base64 (~> 2.0)
-      rubysl-benchmark (~> 2.0)
-      rubysl-bigdecimal (~> 2.0)
-      rubysl-cgi (~> 2.0)
-      rubysl-cgi-session (~> 2.0)
-      rubysl-cmath (~> 2.0)
-      rubysl-complex (~> 2.0)
-      rubysl-continuation (~> 2.0)
-      rubysl-coverage (~> 2.0)
-      rubysl-csv (~> 2.0)
-      rubysl-curses (~> 2.0)
-      rubysl-date (~> 2.0)
-      rubysl-delegate (~> 2.0)
-      rubysl-digest (~> 2.0)
-      rubysl-drb (~> 2.0)
-      rubysl-e2mmap (~> 2.0)
-      rubysl-english (~> 2.0)
-      rubysl-enumerator (~> 2.0)
-      rubysl-erb (~> 2.0)
-      rubysl-etc (~> 2.0)
-      rubysl-expect (~> 2.0)
-      rubysl-fcntl (~> 2.0)
-      rubysl-fiber (~> 2.0)
-      rubysl-fileutils (~> 2.0)
-      rubysl-find (~> 2.0)
-      rubysl-forwardable (~> 2.0)
-      rubysl-getoptlong (~> 2.0)
-      rubysl-gserver (~> 2.0)
-      rubysl-io-console (~> 2.0)
-      rubysl-io-nonblock (~> 2.0)
-      rubysl-io-wait (~> 2.0)
-      rubysl-ipaddr (~> 2.0)
-      rubysl-irb (~> 2.1)
-      rubysl-logger (~> 2.0)
-      rubysl-mathn (~> 2.0)
-      rubysl-matrix (~> 2.0)
-      rubysl-mkmf (~> 2.0)
-      rubysl-monitor (~> 2.0)
-      rubysl-mutex_m (~> 2.0)
-      rubysl-net-ftp (~> 2.0)
-      rubysl-net-http (~> 2.0)
-      rubysl-net-imap (~> 2.0)
-      rubysl-net-pop (~> 2.0)
-      rubysl-net-protocol (~> 2.0)
-      rubysl-net-smtp (~> 2.0)
-      rubysl-net-telnet (~> 2.0)
-      rubysl-nkf (~> 2.0)
-      rubysl-observer (~> 2.0)
-      rubysl-open-uri (~> 2.0)
-      rubysl-open3 (~> 2.0)
-      rubysl-openssl (~> 2.0)
-      rubysl-optparse (~> 2.0)
-      rubysl-ostruct (~> 2.0)
-      rubysl-pathname (~> 2.0)
-      rubysl-prettyprint (~> 2.0)
-      rubysl-prime (~> 2.0)
-      rubysl-profile (~> 2.0)
-      rubysl-profiler (~> 2.0)
-      rubysl-pstore (~> 2.0)
-      rubysl-pty (~> 2.0)
-      rubysl-rational (~> 2.0)
-      rubysl-resolv (~> 2.0)
-      rubysl-rexml (~> 2.0)
-      rubysl-rinda (~> 2.0)
-      rubysl-rss (~> 2.0)
-      rubysl-scanf (~> 2.0)
-      rubysl-securerandom (~> 2.0)
-      rubysl-set (~> 2.0)
-      rubysl-shellwords (~> 2.0)
-      rubysl-singleton (~> 2.0)
-      rubysl-socket (~> 2.0)
-      rubysl-stringio (~> 2.0)
-      rubysl-strscan (~> 2.0)
-      rubysl-sync (~> 2.0)
-      rubysl-syslog (~> 2.0)
-      rubysl-tempfile (~> 2.0)
-      rubysl-thread (~> 2.0)
-      rubysl-thwait (~> 2.0)
-      rubysl-time (~> 2.0)
-      rubysl-timeout (~> 2.0)
-      rubysl-tmpdir (~> 2.0)
-      rubysl-tsort (~> 2.0)
-      rubysl-un (~> 2.0)
-      rubysl-uri (~> 2.0)
-      rubysl-weakref (~> 2.0)
-      rubysl-webrick (~> 2.0)
-      rubysl-xmlrpc (~> 2.0)
-      rubysl-yaml (~> 2.0)
-      rubysl-zlib (~> 2.0)
-    rubysl-abbrev (2.0.4)
-    rubysl-base64 (2.0.0)
-    rubysl-benchmark (2.0.1)
-    rubysl-bigdecimal (2.0.2)
-    rubysl-cgi (2.0.1)
-    rubysl-cgi-session (2.0.1)
-    rubysl-cmath (2.0.0)
-    rubysl-complex (2.0.0)
-    rubysl-continuation (2.0.0)
-    rubysl-coverage (2.0.3)
-    rubysl-csv (2.0.2)
-      rubysl-english (~> 2.0)
-    rubysl-curses (2.0.1)
-    rubysl-date (2.0.9)
-    rubysl-delegate (2.0.1)
-    rubysl-digest (2.0.3)
-    rubysl-drb (2.0.1)
-    rubysl-e2mmap (2.0.0)
-    rubysl-english (2.0.0)
-    rubysl-enumerator (2.0.0)
-    rubysl-erb (2.0.2)
-    rubysl-etc (2.0.3)
-      ffi2-generators (~> 0.1)
-    rubysl-expect (2.0.0)
-    rubysl-fcntl (2.0.4)
-      ffi2-generators (~> 0.1)
-    rubysl-fiber (2.0.0)
-    rubysl-fileutils (2.0.3)
-    rubysl-find (2.0.1)
-    rubysl-forwardable (2.0.1)
-    rubysl-getoptlong (2.0.0)
-    rubysl-gserver (2.0.0)
-      rubysl-socket (~> 2.0)
-      rubysl-thread (~> 2.0)
-    rubysl-io-console (2.0.0)
-    rubysl-io-nonblock (2.0.0)
-    rubysl-io-wait (2.0.0)
-    rubysl-ipaddr (2.0.0)
-    rubysl-irb (2.1.1)
-      rubysl-e2mmap (~> 2.0)
-      rubysl-mathn (~> 2.0)
-      rubysl-thread (~> 2.0)
-    rubysl-logger (2.1.0)
-    rubysl-mathn (2.0.0)
-    rubysl-matrix (2.1.0)
-      rubysl-e2mmap (~> 2.0)
-    rubysl-mkmf (2.0.1)
-      rubysl-fileutils (~> 2.0)
-      rubysl-shellwords (~> 2.0)
-    rubysl-monitor (2.0.0)
-    rubysl-mutex_m (2.0.0)
-    rubysl-net-ftp (2.0.1)
-    rubysl-net-http (2.0.4)
-      rubysl-cgi (~> 2.0)
-      rubysl-erb (~> 2.0)
-      rubysl-singleton (~> 2.0)
-    rubysl-net-imap (2.0.1)
-    rubysl-net-pop (2.0.1)
-    rubysl-net-protocol (2.0.1)
-    rubysl-net-smtp (2.0.1)
-    rubysl-net-telnet (2.0.0)
-    rubysl-nkf (2.0.1)
-    rubysl-observer (2.0.0)
-    rubysl-open-uri (2.0.0)
-    rubysl-open3 (2.0.0)
-    rubysl-openssl (2.2.1)
-    rubysl-optparse (2.0.1)
-      rubysl-shellwords (~> 2.0)
-    rubysl-ostruct (2.0.4)
-    rubysl-pathname (2.1.0)
-    rubysl-prettyprint (2.0.3)
-    rubysl-prime (2.0.1)
-    rubysl-profile (2.0.0)
-    rubysl-profiler (2.0.1)
-    rubysl-pstore (2.0.0)
-    rubysl-pty (2.0.3)
-    rubysl-rational (2.0.1)
-    rubysl-resolv (2.1.2)
-    rubysl-rexml (2.0.4)
-    rubysl-rinda (2.0.1)
-    rubysl-rss (2.0.0)
-    rubysl-scanf (2.0.0)
-    rubysl-securerandom (2.0.0)
-    rubysl-set (2.0.1)
-    rubysl-shellwords (2.0.0)
-    rubysl-singleton (2.0.0)
-    rubysl-socket (2.0.1)
-    rubysl-stringio (2.0.0)
-    rubysl-strscan (2.0.0)
-    rubysl-sync (2.0.0)
-    rubysl-syslog (2.1.0)
-      ffi2-generators (~> 0.1)
-    rubysl-tempfile (2.0.1)
-    rubysl-test-unit (2.0.2)
-      minitest
-    rubysl-thread (2.0.3)
-    rubysl-thwait (2.0.0)
-    rubysl-time (2.0.3)
-    rubysl-timeout (2.0.0)
-    rubysl-tmpdir (2.0.1)
-    rubysl-tsort (2.0.1)
-    rubysl-un (2.0.0)
-      rubysl-fileutils (~> 2.0)
-      rubysl-optparse (~> 2.0)
-    rubysl-uri (2.0.0)
-    rubysl-weakref (2.0.0)
-    rubysl-webrick (2.0.0)
-    rubysl-xmlrpc (2.0.0)
-    rubysl-yaml (2.1.0)
-    rubysl-zlib (2.0.1)
-    sqlite3 (1.3.10)
-    thor (0.19.1)
-    thread_safe (0.3.5)
-    tzinfo (1.2.2)
-      thread_safe (~> 0.1)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  activerecord (= 4.1.10)
-  activerecord-jdbcsqlite3-adapter
-  acts_as_list!
-  appraisal
-  bundler (>= 1.0.0)
-  minitest
-  rake
-  rubinius-developer_tools
-  rubysl (~> 2.0)
-  rubysl-test-unit
-  sqlite3
diff --git a/gemfiles/rails_4_2.gemfile b/gemfiles/rails_4_2.gemfile
index 8e460bd5..09fa07c9 100644
--- a/gemfiles/rails_4_2.gemfile
+++ b/gemfiles/rails_4_2.gemfile
@@ -6,10 +6,11 @@ gem "sqlite3", :platforms => [:ruby]
 gem "activerecord-jdbcsqlite3-adapter", :platforms => [:jruby]
 gem "rake"
 gem "appraisal"
-gem "activerecord", "4.2.1"
+gem "github_changelog_generator"
+gem "activerecord", "~> 4.2.1"
 
 group :test do
-  gem "minitest"
+  gem "minitest", "~> 5.0"
 end
 
 platforms :rbx do
diff --git a/gemfiles/rails_4_2.gemfile.lock b/gemfiles/rails_4_2.gemfile.lock
deleted file mode 100644
index 5d90bf02..00000000
--- a/gemfiles/rails_4_2.gemfile.lock
+++ /dev/null
@@ -1,53 +0,0 @@
-PATH
-  remote: ../
-  specs:
-    acts_as_list (0.7.2)
-      activerecord (>= 3.0)
-
-GEM
-  remote: http://rubygems.org/
-  specs:
-    activemodel (4.2.1)
-      activesupport (= 4.2.1)
-      builder (~> 3.1)
-    activerecord (4.2.1)
-      activemodel (= 4.2.1)
-      activesupport (= 4.2.1)
-      arel (~> 6.0)
-    activesupport (4.2.1)
-      i18n (~> 0.7)
-      json (~> 1.7, >= 1.7.7)
-      minitest (~> 5.1)
-      thread_safe (~> 0.3, >= 0.3.4)
-      tzinfo (~> 1.1)
-    appraisal (1.0.3)
-      bundler
-      rake
-      thor (>= 0.14.0)
-    arel (6.0.0)
-    builder (3.2.2)
-    i18n (0.7.0)
-    json (1.8.2)
-    minitest (5.5.1)
-    rake (10.4.2)
-    sqlite3 (1.3.10)
-    thor (0.19.1)
-    thread_safe (0.3.5)
-    tzinfo (1.2.2)
-      thread_safe (~> 0.1)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  activerecord (= 4.2.1)
-  activerecord-jdbcsqlite3-adapter
-  acts_as_list!
-  appraisal
-  bundler (>= 1.0.0)
-  minitest
-  rake
-  rubinius-developer_tools
-  rubysl (~> 2.0)
-  rubysl-test-unit
-  sqlite3