Fix Custom Content loader for physical devices of iOS and Windows phone 8.  The type was still marked as cocos2d-xna instead of CocosSharp Assembly reference.
Fix Custom Content loader for physical devices of iOS and Windows phone 8.  The type was still marked as cocos2d-xna instead of CocosSharp Assembly reference.

--- Please read the following discussions for the reasons of this.
     http://monogame.codeplex.com/discussions/393775
     http://monogame.codeplex.com/discussions/396792

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