Update to work with the new layers Texture abstraction.
Merge pull request #30 from pcwalton/texture-wrapper

Update to work with the new layers Texture abstraction.
Add a function to steal a texture from a GL context
Merge pull request #29 from pcwalton/steal

Add a function to steal a texture from a GL context
Remove the now-unneeded texture manager.

This also breaks the dependency on layers.
Merge pull request #31 from pcwalton/no-texture-manager

Remove the now-unneeded texture manager.
transformation and clip
Merge remote-tracking branch 'upstream/master'