WIP representable
Refactor YouTube Provider to use representable
Introduce raw_response to Vimeo

* Stub it out in the tests
* Make sure duration is returned as an integer
Fetch should be memorized
YouTube using self instead of OpenStruct for Representable
DRY up YouTube provider class
no need for raw response to be memoized
Virtus Coercion fails when used in conjunction with nested

* This is a workout until https://github.com/apotonick/representable/issues/87 is fixed
Merge branch 'representable'