Update README.md
  -Deleted RailsBridge from What To Contribute section because RailsBridge is a contributed resource
Bug Fix - RailsBridge from _post
  -Website was not being redirected to the RailsBridge website.
  -Updated to the main railsbridge.org website
Deleted
  -Duplicate 2013-8-18 RailsBridge.html found in the IWantToLearnRuby and _post folders
Modified
  -Spelling error in the RailsBridge file in the _post folder
Merge railsbridge changes.