Update README.md

[Readme] Note about Spine-Unity when using large atlas images.
update convenience constructors for CCSkeleton, CCSkeletonAnimation
Fixed alpha in spine-xna.

#121
spine-xna no longer premultiplies alpha on load. Do it when packing the atlas.

This is just simpler all around. The renderer has a setting to know if premultiplied is being used. #121
Merge pull request #118 from slow-banshee/master

update convenience constructors for CCSkeleton, CCSkeletonAnimation
Merge pull request #115 from pharan/patch-1

Updating Readme. Note about Spine-Unity when using large atlas images.
Reset draw order in setSlotsToSetupPose.
Merge branch 'origin/master'
Refactored AnimationState to better support setting a to/from time.

#113
Wasn't using drawOrder.
Modifed the spine-xna example to be more "XNA-like" using a Content project. (This is in preparation to move Spine data to the content pipeline.)
Added SpriteBatchRenderer and modified the example to use it.