Support for EPUB 3.0.1 collections.
Basic support has been added. Explicit handling for Previews, AHL, and Indices will follow at a later date.
Merge branch 'feature/collections' into develop

* feature/collections:
  Support for EPUB 3.0.1 collections. Basic support has been added. Explicit handling for Previews, AHL, and Indices will follow at a later date.

Conflicts:
	Platform/Apple/ePub3.xcodeproj/project.pbxproj