Mixed layout support
Merge branch 'feature/fixed_layout_and_more' into feature/mixed_layout_support
Debugging mixed Layout in progress
Implemented a hack to read layout property for spine items
Support for mixed layout book implemented
Compailing agains latest dbelop brunch
Implementing reading properties using ->PropertyMatching(… sdk API calls
In progress
Hidden JSDocs for non public functions and objects
Cleanup property retreaval
Merge branch 'develop' into feature/mixed_layout_support

Conflicts:
	readium-sdk
Merge branch 'feature/mixed_layout_support' into develop