Merge pull request #24 from googlesamples/experimental/ar

Experimental/ar
- change namespace.
- change app name.
Merge branch 'master' into fix/unified_motion_tracking_without_callback
New Icon Set.
Merge branch 'master' into fix/unified_motion_tracking_without_callback
- clean out the unused code
- push all cleaned code.
Merge pull request #27 from googlesamples/fix/unified_motion_tracking_without_callback

Fix/unified motion tracking without callback
Set activity to full screen for correct 16:9 screen ratio for colour camera's image plane ratio 1280:720.
Immersive mode enabled.