Implement a LevelLoader and a barebones Level.
Move the test level into an XML file. Still some work to be done here, but the plumbing is there.
Add docu-comments on the public API for LevelLoader.
Make LevelLoader a static class.
Merge pull request #24 from comp380team3/level-loader

Level Loader implementation
Project file didn't save properly earlier. (This seems to happen frequently.)
Merge branch 'master' into michael_new_menu

Conflicts:
	PuzzlePathDimensionContent/PuzzlePathDimensionContent.contentproj