Update to layer 18, usernames support, UI improvements
Fixed video compression in Android L, bug fixes
Crash fixes
Enable screenshot detection
Different improvements
Crash fix
Bug fixes
Different improvements
Bug fixes
Bug fixes
Merge branch 'dev' of https://github.com/DrKLO/Telegram

Conflicts:
	TMessagesProj/src/main/java/org/telegram/ui/Cells/ChatMediaCell.java
	TMessagesProj/src/main/java/org/telegram/ui/SettingsActivity.java