Merge pull request #134 from mono/master

Replace Create factory methods with constructors
Windows 8 support for Box2d Fixed
Merge pull request #136 from BluNova/master

Box2D Windows 8 Support fixed
winrt project compiles. Added storage container support in CCUserDefault and removed the type converter references for Win8/RT. Added NETFX_CORE idioms to isolate CF code from non-CF capabilities.
fix for #137
mono #64.
change create method for ctors.
misc changes to set a ref to marker felt and to set the game timing to be fixed step.
fixing some warnings.
Type safety of CCActionManager