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.
More AnimationState refactoring, getting good!

#113
Minor cleanup.
Event timeline for spine-c, AnimationState refactoring.

closes #113
spine-tk2d and spine-unity updated to latest spine-csharp.

closes #120
closes #125
Compile with C89.
Nix printf.
Fixed AnimationState mixing.
spine-cocos2dx updated to latest spine-c API.

This has some API breakage, sorry. The new AnimationState now handles multiple "tracks", which makes it easier to apply and queue multiple animations at the same time, no longer do we need multiple AnimationStates.
Merge branch 'master' of https://github.com/EsotericSoftware/spine-runtimes
cocos2dx style AnimationState event callback for CCSkeletonAnimation.