set/addAnimation doesn't allow null animation.
Don't crash if animation is not found.

http://www.esotericsoftware.com/forum/viewtopic.php?f=7&t=1379
Support Unity lighting.
Support Unity lighting.
Much better normals calculation.
Shadows for non-lit shader.
Double buffer meshes.

Number 13:
http://docs.unity3d.com/Documentation/Manual/MobileOptimisation.html
C89 comment
Prefixed all spine-c structs and functions with "sp".

Holy refuctoring! Sorry for the change, but some libraries were having naming conflicts. You can define SPINE_SHORT_NAMES before including spine-c headers if you want to use structs and functions without the "sp" prefix, as it was before.
changed findEvent to FindEvent (C# method naming)
changed findEvent to FindEvent (to match change in SkeletonData.cs)
Merge pull request #132 from pharan/patch-2

changed findEvent to FindEvent (C# method naming)
Merge pull request #133 from pharan/patch-3

changed findEvent to FindEvent (to match change in SkeletonData.cs)
Added timeline type.
Merge branch 'origin/master'
Fixed Clear.
Fixed clearing tracks in event callbacks.

closes #134
Updated to Starling 1.4. Fixed Starling atlas loading. Minor optimizations.
Use 3 arg Enum.Parse.
spine-as3 keyable draw order, events, and new AnimationState.