Added push notification to sample app
Updated readme
Merge branch 'checkout' into 20131025-federated-cloud-contacts-APNS
Merged with master
Updated logic for handling push notifications.
Updated APNS logic for making call when other part is not available.
Updated targets. Updated the way missed call is handled.
Did some code cleanup
Updated cache logic
Updated cache logic
Updated comments
Updated logger on application side.
fixed linking issue
Fixed the issue when incorrect message is shown for dropped call.
Fixed corrupted UI, on session switch.
More bugs  related to unread messages badge is fixed.
Moved cache to SDK. Fixed some minor bugs.
Merge commit '883914a79631f8fe2ceb6385e4a2be1b4cb64a9b' into 20131025-federated-cloud-contacts