NFC: check received message, receive on API 9
Don't allow EmailDestination of an existing contact to change
Move add contact action to FAM
Icon for scanning QR codes
QR code scanning
Zoom QR code on click
Updated Gradle Witness

Source: https://github.com/WhisperSystems/gradle-witness
Git commit: 10f1269c0aafdc1d478efc005ed48f3a47d44278
Use same layout for viewing identities and contacts
Extract common code for viewing identities and contacts

Side-effect: view contact page now shows QR code