Remove gdx-ai from core repo
Added stencil buffer to FrameBuffer.
Added matching constructor to existing code.
Add Usage#ColorUnpacked, deprecate Usage#Color.
Merge branch 'master' of github.com:libgdx/libgdx
Added a test for stenciled framebuffer.
Removed unneccesary changes.
Removed unneccesary matrix and added a comment what should be seen.
Merge pull request #2338 from ollipekka/master

FrameBuffer to include stencil attachment
Merge pull request #2336 from xoppa/various

Add Usage.ColorUnpacked, deprecate Usage.Color.
Merge pull request #2312 from Tom-Ski/master

Remove gdx-ai from core repo
Update CONTRIBUTING.md

Correct link to wiki page explaining how to work with source, run demos and tests.
Merge pull request #2360 from guillaume-alvarez/patch-1

Correct link to wiki page explaining how to work with source
Update CHANGES
javadoc typo correction.