Added skinning, compatible with 1.8.19.
Merge branch 'origin/master'
Ctor taking ShapeRenderer.
Setter for attachment vertices.
Additive blending support.
Update README.md
Update README.md
libgdx runtime, box2d as extension

Need new lib in build path to run box2d test.
Merge pull request #208 from semtiko/patch-1

libgdx runtime, box2d as extension
Support for rotated atlas regions.
Minor changes.
setSkin with no previous skin attaches setup pose attachments.

No more API gotcha, setSlotsToSetupPose is not needed.
License header update.

2 -> 2.1 (clearer how permission is granted, formatting).
Support attachment loader discarding attachment by returning null.
Formatting.
Fixed mesh hull debug rendering.
Throw exception if a mesh can't be rendered.
Fixed debug drawing when non-essential data was not exported.
Change Variable name.
Fixed mixing two animations using different time scales.