Cocos2d-x 3.0 Windows Phone 8 support

This pull requests contains all of the projects and files needed to build cocos2d-x 3.0 for Windows Phone 8.0.

Future pull requests will add support for the following items:

1. Accelerometer
2. Custom shaders (needed for shader tests)
3. Console support
4. modifications to cocos2d-console to fully support cpp template for WP8