Added Immersive Mode option
Added Android 4.4 Kitkat Immersive Support
Fixed accidental typos, sorry.
Added Actual Immersive Mode
Updated Android library to Android 4.4 for Immersive Mode

Immersive Mode needs a flag that requires the Android 4.4 libraries
Fixed Immersive Mode not reappearing

When an app was brought to the background and back, the immersive mode
would not stay
Updated gdx-controllers-android to Android 4.4
Fixes
Immersive Mode Fixes, formatting
Fix crash on Pre-Honeycomb devices
ModelBatch: keep track of obtained renderables
Dont need this anymore
Changed newInstance to protected in Json
Enables overload in the instance creation (to use Pools instead of reflection, for example).
documentation cleanup
added toString(int keycode) and valueOf(String keyname) to Input.Keys
DefaultShader: use Config instead of static vars
change IntMap to ObjectMap
change ObjectMap to ObjectIntMap
Better methods names.
setDrawable should invalidate when old drawable is null.

closes #1016