Initial refactor of Note into a separate service.

Still need to create Remote service to extract networking code from the NoteService.
Updated copyright information in new classes
Extracted remote calls into a separate class NoteServiceRemote
Fixed missing method implementation due to name change
Merge pull request #1515 from wordpress-mobile/feature/refactor-note-into-service

Refactor Note to separate business logic
Merge remote-tracking branch 'origin/develop' into issue/1054-improving-comment-like-notification-ui

Conflicts:
	WordPress/Classes/Note.m