Blender Git Loki

RNA Fixes
* Python apis iterator didnt work, for example [f for f in mesh.faces] # failed.
* Python apis collection.items(), collections without names now return (index,value) pairs, better then returning nothing.
* bpy.ui and bpy.props modules were incorrectly named
* Mesh vertex colors red/blue needed to be swapped on getting/setting.
* Mesh vertex colors were not clamped.