Add MonoGame projects.

git-tfs-id: [https://tfs.codeplex.com:443/tfs/TFS15]$/Atomix;C42124
Rename to correct sln.

git-tfs-id: [https://tfs.codeplex.com:443/tfs/TFS15]$/Atomix;C42125
Rename LevelEditor to Editor.

git-tfs-id: [https://tfs.codeplex.com:443/tfs/TFS15]$/Atomix;C42126
Remove XBOX variants.

git-tfs-id: [https://tfs.codeplex.com:443/tfs/TFS15]$/Atomix;C42127
Add content projects to Library solution.

git-tfs-id: [https://tfs.codeplex.com:443/tfs/TFS15]$/Atomix;C42128
Remove non games projects from Kinectomix solution.

git-tfs-id: [https://tfs.codeplex.com:443/tfs/TFS15]$/Atomix;C42129