3.7
  * Improved Android 6 support (permissions, integration into text selection)
  * API: Version 10

3.6
  * Encrypted backups
  * Security fixes based on external security audit
  * YubiKey NEO key creation wizard
  * Basic internal MIME support
  * Automatic key synchronization
  * Experimental feature: link keys to Github, Twitter accounts
  * Experimental feature: key confirmation via phrases
  * Experimental feature: dark theme
  * API: Version 9