About system, keepalive, UI fixes.

• New About system in preferences (tap to copy).
• minor UI fixes
• Keepalive message initial support
• Fixed crash for malformed video URI

Android 9 compatibility fix

Merge pull request #4 from iakov/master

v31: New logo, Android 9, new build-tools

Compatibility fix

20180329-v29

v29: fix permissions in manifest

v27 +Oreo -Gingerbread

20171230-v27

Android 8.1 compatibility; dropped ver 2.3.x compatibility

v24 (v23 with Gingerbread)

20160623

v24 with Gigngerbread support

v23 release candidate

Performance testing.

v22 beta

Pre-release for public testing.
Optimized memory usage, improved performance, fixed few small usability issues.

v20 beta

20160413

v20 beta with APK