Change the directory of Bootstrap from '_assets' to static 'assets'.

assets/vendor/bootstrap/_config.yml

@@ -0,0 +1,37 @@
+# Dependencies
+markdown:         rdiscount
+pygments:         true
+
+# Permalinks
+permalink:        pretty
+
+# Server
+source:           ./docs
+destination:      ./_gh_pages
+host:             0.0.0.0
+port:             9001
+baseurl:          /
+url:              http://localhost:9001
+encoding:         UTF-8
+
+exclude:
+  - "jade"
+  - "vendor"
+
+# Custom vars
+current_version:  3.1.1
+repo:             https://github.com/twbs/bootstrap
+sass_repo:        https://github.com/twbs/bootstrap-sass
+
+download:
+  source:         https://github.com/twbs/bootstrap/archive/v3.1.1.zip
+  dist:           https://github.com/twbs/bootstrap/releases/download/v3.1.1/bootstrap-3.1.1-dist.zip
+  sass:           https://github.com/twbs/bootstrap-sass/archive/v3.1.1.tar.gz
+
+blog:             http://blog.getbootstrap.com
+expo:             http://expo.getbootstrap.com
+
+cdn:
+  css:            //netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css
+  css_theme:      //netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap-theme.min.css
+  js:             //netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js