Start Continuous Build.

Add ANT default.build file
Refactor Windows, WindowsGL and WindowsPhone solutions to no include tests
Add new Tests solutions for Windows, WindowsGL and WindowsPhone.
Merge branch 'master' of https://github.com/mono/cocos2d-xna
Refactor Windows8 project and add to build system.
Add NuGet generation to the build for Windows
Merge pull request #222 from mono/master

Start Continuous Build.