Bring code in line with C++ and obj-c code and Replace Create factory with constructor

https://github.com/mono/cocos2d-xna/issues/76
https://github.com/mono/cocos2d-xna/issues/77
https://github.com/mono/cocos2d-xna/issues/73
https://github.com/mono/cocos2d-xna/issues/78
https://github.com/mono/cocos2d-xna/issues/79
https://github.com/mono/cocos2d-xna/issues/80
https://github.com/mono/cocos2d-xna/issues/81
https://github.com/mono/cocos2d-xna/issues/82
https://github.com/mono/cocos2d-xna/issues/83
https://github.com/mono/cocos2d-xna/issues/84
https://github.com/mono/cocos2d-xna/issues/85
https://github.com/mono/cocos2d-xna/issues/86