Updated data model for cache and data
Refactored messaging.
Merge commit '838b305281821bd8af232a5c42c87e91d615371c' into 20131025-federated-cloud-contacts

Conflicts:
	Samples/OpenPeerSampleApp/OpenPeerSampleApp.xcodeproj/project.pbxproj

Fixed ringing issue. Removed association option. Improved messaging experience.