Implemented own ActionBar and Fragments, swipe back navigation, https://github.com/DrKLO/Telegram/issues/424
(cherry picked from commit 3fecce9)
Previous commit fixes
(cherry picked from commit e657c4f)
removed one more ActionBarActivity
(cherry picked from commit c1896e9)
Fixed app startup on Android 2.x, crash fixes
(cherry picked from commit 2c61da0)
One more crash fix
(cherry picked from commit 231999e)
Let swipe back from any place
(cherry picked from commit 63ba8a5)
Ask confirmation when starting secret chat and sharing contact info

Thanks to https://github.com/DrKLO/Telegram/pull/401
(cherry picked from commit cdb39ac)