Remove gdx-ai from core repo
fixed PolygonRegionLoader GWT compatibility and error report

removed call to Class#getSimpleName() for GWT compatibility
throws GdxRuntimeException instead of logging to Gdx.app.error(..)
Skin, fixed getting TiledDrawable by specifying a region name.

closes #2329
Merge remote-tracking branch 'origin/master'
add Affine2 matrix, optimize scene2d group transform
GWT compatibility; name change
fixed build by depending on RoboVM SNAPSHOTS for now :(
merged CHANGES
Merge remote-tracking branch 'origin/master'
Fixed setLayoutEnabled.

closes #2334
Fix indexing when creating chain from float[]
Remove unused imports
Added stencil buffer to FrameBuffer.
Added matching constructor to existing code.
Update CHANGES
Add Usage#ColorUnpacked, deprecate Usage#Color.
Fix indexing when creating loop from float[]
Merge branch 'master' of github.com:libgdx/libgdx
Added a test for stenciled framebuffer.
Removed unneccesary changes.