Blender Git Loki

Add operator to extract armature and vertex groups from skin.

* The operator creates bones for each input edge (does not subdivide
them like the skin operator does), adds a fake root bone for skin
roots with multiple children.

* The operator adds vertex weight groups to the original mesh.

* Make copy_object_transform() public, used to match the armature
object to the mesh object.

Skin modifier documentation:
http://wiki.blender.org/index.php/User:Nicholasbishop/SkinModifier