Added convenience members for doing anchor point designations
removed the old readme and replaced with the new readme from mono.
Merge branch 'master' of https://github.com/totallyevil/cocos2d-xna
Merge pull request #272 from Cocos2DXNA/CONVENIENT_ANCHOR_POINTS

Added convenience members for doing anchor point designations
added a convenience method for reading the sprite sheet plist from a stream.
Merge remote-tracking branch 'remotes/gena-m/master'