Add rating view

[ggayan]

Done:

• [X] Link view contents to route information
• [X] Add delegate methods for submit/cancel actions
• [X] Declare protocol for backend operations

Pending (maybe for another PR):

• [ ] Implement MockRepository and find a way to use it in the application by only referencing the protocol.
• [ ] Use notifications instead of delegate for rating control actions

[yonpols]

Looks good. I'm implementing a notification that should be caught by the Home controller and show this popup.

[ggayan]

Yup.