surespot encrypted messenger

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V62

Fix lollipop image rotation issues.
Use official keystore API for Android M.
Fix url shortener.
Don’t show every user as having new messages on restore identity/clear local cache.
Security improvements - new keys are signed by previous version of the key creating a chain of trust back to the initial key pair.
Remove identity from device without deleting identity in the system.
Handle graceful migration to upcoming version with breaking API changes.