Bumped Rails version to 4.0.0
Changed _filter to _action
Merge branch 'develop' into rails4
Moved config.assets.precompile to application.rb

http://stackoverflow.com/questions/14882337/rails-4-assets-precompile
Fixed fontawesome issue
Heroku deploy support
Merge branch 'develop' into rails4
Merge branch 'develop' into rails4
Merge branch 'develop' into rails4
Fixed raw_file issue
Merge branch 'develop' into rails4
Merge branch 'develop' into rails4
Added ace editor for body of gist file.
Supported ace text mode. Added ace as a submodule.
Wrote about git submodule on README.
Started using github code theme and 2 spaces for tab.
Made code editor responsible.
Use public git submodule URL.
Fix the installation section of README.
CHANGELOG for 1.2.0