Bounding boxes for spine-c and spine-sfml.
Renamed ComputeVertices to ComputeWorldVertices.

Sorry for the API breakage, but this is line with UpdateWorldTransform, BoundingBoxAttachment, and future attachments.
Simplified SkeletonBounds AABB computation.
Renamed Polygon struct.
spine-cocos2dx now compiles with latest spine-c.
spine-cocos2d-iphone compiles with latest spine-c.
Inherit scale/rotation and additive blending for spine-as3 and spine-starling.
Inherit scale/rotation and additive blending for spine-js.
Adding a nuget spec
Merge branch 'master' of https://github.com/EsotericSoftware/spine-runtimes