Fix build by using precise distro, added more Ruby versions to test

.travis.yml

@@ -1,13 +1,24 @@
+language: ruby
+sudo: false
+
 rvm:
   - 2.1
-  - 2.2.2
-
-script: "bundle exec rake clean spec cucumber"
+  - 2.2
+  - 2.3
+  - 2.4
 
+# FIXME: fails with modern bundler
 before_install:
   - rvm @global do gem uninstall bundler -a -x
   - rvm @global do gem install bundler -v 1.12.5
 
+script: "bundle exec rake clean spec cucumber"
+
+addons:
+  apt:
+    packages:
+    - ghostscript
+
 gemfile:
   - gemfiles/4.2.gemfile
   - gemfiles/5.0.gemfile
@@ -17,6 +28,3 @@ matrix:
   exclude:
     - gemfile: gemfiles/5.0.gemfile
       rvm: 2.1
-
-sudo: false
-cache: bundler

features/step_definitions/rails_steps.rb

@@ -8,17 +8,16 @@
 
   steps %{
     And I turn off class caching
-    And I fix the application.rb for 3.0.12
     And I write to "Gemfile" with:
       """
       source "http://rubygems.org"
       gem "rails", "#{framework_version}"
-      gem "sqlite3", "1.3.8", :platform => [:ruby, :rbx]
+      gem "sqlite3", :platform => [:ruby, :rbx]
       gem "activerecord-jdbcsqlite3-adapter", :platform => :jruby
       gem "jruby-openssl", :platform => :jruby
       gem "capybara"
       gem "gherkin"
-      gem "aws-sdk"
+      gem "aws-sdk", "~> 2.0.0"
       gem "racc", :platform => :rbx
       gem "rubysl", :platform => :rbx
       """
@@ -30,14 +29,6 @@
   FileUtils.chdir("../../..")
 end
 
-Given "I fix the application.rb for 3.0.12" do
-  cd(".") do
-    File.open("config/application.rb", "a") do |f|
-      f << "ActionController::Base.config.relative_url_root = ''"
-    end
-  end
-end
-
 Given "I allow the attachment to be submitted" do
   cd(".") do
     transform_file("app/controllers/users_controller.rb") do |content|
@@ -174,7 +165,7 @@ def attach_attachment(name, definition = nil)
 
 When /^I configure the application to use "([^\"]+)" from this project$/ do |name|
   append_to_gemfile "gem '#{name}', :path => '#{PROJECT_ROOT}'"
-  steps %{And I run `bundle install --local`}
+  steps %{And I successfully run `bundle install --local`}
 end
 
 When /^I configure the application to use "([^\"]+)"$/ do |gem_name|