Upgrade gems 1

Upgraded the following gems:
 * twitter-bootstrap-rails, sass-rails, coffee-rails
 * therubyracer, uglifier, rb-fsevent

The only gems with version numbers are:
 * ruby "2.0.0"
 * gem 'rails', '3.2.12'
 * gem 'minitest', '3.5.0' (needed for workaround; "mocho monkey patching")
   * http://stackoverflow.com/questions/12752905/no-mocha-monkey-patch-for-minitest-version-runtimeerror
 * gem 'jquery-rails', '2.1.4' (needed for has_css?; 2.2+ causes two tests to break)