Implemented own ActionBar and Fragments, swipe back navigation, https://github.com/DrKLO/Telegram/issues/424
Previous commit fixes
removed one more ActionBarActivity
Fixed app startup on Android 2.x, crash fixes
One more crash fix
Let swipe back from any place
Ask confirmation when starting secret chat and sharing contact info

Thanks to https://github.com/DrKLO/Telegram/pull/401
Merge remote-tracking branch 'remotes/upstream/dev' into dev

Conflicts:
	TMessagesProj/src/main/java/org/telegram/ui/ChatProfileActivity.java
	TMessagesProj/src/main/java/org/telegram/ui/SettingsNotificationsActivity.java
	TMessagesProj/src/main/java/org/telegram/ui/UserProfileActivity.java
	TMessagesProj/src/main/java/org/telegram/ui/Views/BaseFragment.java
Merge remote-tracking branch 'remotes/upstream/dev' into dev

Conflicts:
	TMessagesProj/src/main/java/org/telegram/ui/ChatProfileActivity.java
	TMessagesProj/src/main/java/org/telegram/ui/SettingsNotificationsActivity.java
	TMessagesProj/src/main/java/org/telegram/ui/UserProfileActivity.java
	TMessagesProj/src/main/java/org/telegram/ui/Views/BaseFragment.java