Created Channel model
Created scaffolded Channel controller
Customize guard for running Rspec and Cucumber
Added dependency with feedzirra
Use DatabaseCleaner instead of transactional fixtures
Validate channel URL as feed and retrieve title
Removed Guard+Zeus integration as it's running each test twice
Temporarily disabled failing scaffolded ChannelsController tests
Updated Channel edition form
Removed JSON responses from ChannelsController
Created Subscription model
Implemented Subscription.subscribe method
Moved Channel feed validation out of before_create hook
Added factory_girl dependency
Renamed InvalidChannel to InvalidChannelException
Implemented Subscription create action
Removed views specs
Implemented Subscription index view
Show subscription details when selecting on the list
Removed Subscription edit