#268 - Fix for NRE in b2Joint construction.
#268 - Fix for NRE in b2Joint construction.

hig-ag/CocosSharp,hig-ag/CocosSharp,TukekeSoft/CocosSharp,mono/cocos2d-xna,mono/CocosSharp,netonjm/CocosSharp,MSylvia/CocosSharp,haithemaraissia/CocosSharp,netonjm/CocosSharp,MSylvia/CocosSharp,zmaruo/CocosSharp,TukekeSoft/CocosSharp,mono/CocosSharp,haithemaraissia/CocosSharp,mono/cocos2d-xna,zmaruo/CocosSharp