Fix for world transform using the first parent transform twice.
Forgot the first node to parent transform.
Added world transform and target-node transform helpers for rectangles and points.
Removed erroneous public flag and added caching of the node to world transform.
Merge pull request #377 from Cocos2DXNA/FIX_WORLD_TRANSFORM_BUG

Fix for world transform using the first parent transform twice.