Merge pull request #1 from hkjellander/origin/kjellander

Origin/kjellander
Move to compileSdkVersion 20.

Instead of using explicit L preview, this allows us to run the app on
pre-L devices while still building with API 20.
Merge pull request #2 from hkjellander/pbos-api20

Move to compileSdkVersion 20.
Inflating the AppRTCGLView from XML instead of code.