fix fail to load resource of bootstrap-3

see more in ：
plusjade/jekyll-bootstrap#302
plusjade/jekyll-bootstrap@097e330

解決辦法：
先到你的部落格專案 > assets > themes底下建立一個名為bootstrap-3的資料夾，然後再將bootstrap與css資料夾一併丟入bootstrap-3的資料夾內即可。

Gemfile.lock

@@ -0,0 +1,54 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    addressable (2.5.1)
+      public_suffix (~> 2.0, >= 2.0.2)
+    colorator (1.1.0)
+    ffi (1.9.18-x64-mingw32)
+    forwardable-extended (2.6.0)
+    jekyll (3.4.3)
+      addressable (~> 2.4)
+      colorator (~> 1.0)
+      jekyll-sass-converter (~> 1.0)
+      jekyll-watch (~> 1.1)
+      kramdown (~> 1.3)
+      liquid (~> 3.0)
+      mercenary (~> 0.3.3)
+      pathutil (~> 0.9)
+      rouge (~> 1.7)
+      safe_yaml (~> 1.0)
+    jekyll-sass-converter (1.5.0)
+      sass (~> 3.4)
+    jekyll-sitemap (1.1.1)
+      jekyll (~> 3.3)
+    jekyll-watch (1.5.0)
+      listen (~> 3.0, < 3.1)
+    kramdown (1.13.2)
+    liquid (3.0.6)
+    listen (3.0.8)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+    mercenary (0.3.6)
+    multi_json (1.12.1)
+    pathutil (0.14.0)
+      forwardable-extended (~> 2.6)
+    public_suffix (2.0.5)
+    pygments.rb (1.1.2)
+      multi_json (>= 1.0.0)
+    rb-fsevent (0.9.8)
+    rb-inotify (0.9.8)
+      ffi (>= 0.5.0)
+    rouge (1.11.1)
+    safe_yaml (1.0.4)
+    sass (3.4.24)
+
+PLATFORMS
+  x64-mingw32
+
+DEPENDENCIES
+  jekyll (~> 3.1)
+  jekyll-sitemap
+  pygments.rb
+
+BUNDLED WITH
+   1.15.0