Added in LevelContainer files. Added a couple properties to LevelViewController.
Also, there seems to be a phantom “Level5Storyboard” floating about - you’ll notice, it properly goes to the first screen of that level, but nowhere does that level actually exist. :/
Got rid of some semi-meaningless warnings. One important thing: made the once_token static!
Merge pull request #44 from zsweedyk/TemporaryLevelContainer

Added in LevelContainer. It is still not used anywhere.