Merge pull request RestComm#839 from ognjenns/master

Merge and small changes

Update SDK maven artifact in Hello World sample

Fixed travis build issue

Fixed an issue that didn't allow premium version of Olympus to be upl…

…oaded to TF

Fixed RestComm#539: Olympus upgrade between consecutive Travis CI bui…

…lds fails

1.0.0 BETA4 Official Release

Fixed RestComm#256: Fix about commit hash

Fixes RestComm#184: Add webrtc video support to Hello World sample ap…

…plication

Fixes RestComm#116: Some more updates in the javadoc for changes due …

…to webrtc

Fixes RestComm#68: Add workaround for incoming media, so that the MS …

…announcements aren't truncated. Fixes RestComm#64: Crash when reopening the App if it was closed with 'back' button. Fixes RestComm#69: Add Audio Focus in the activity as well