Add RVM stuff

Through the use of .powrc file enable Pow to read RVM configurations.
Update README
Dynamically load SECRET_KEY_BASE environment variable
Configure Capistrano
Scaffold landing page
Log all user agents

Want to detect Chromecast user-agent string
Basic launching mechanism
Start the receiver code
Autoclose window
Limit number of kept deployments
Store Chromecast App ID in environment var
Coffeescript source maps for development
Load available receivers
Bug in getResultCallback
Bug in getMediaStatus
Launch application on Chromecast
Cleanup the controller
Cleanup the receiver page