Added in LevelContainer files. Added a couple properties to LevelViewCon...

Added in LevelContainer files. Added a couple properties to LevelViewController.
Some VERY rudimentary test of the LevelContainer, just of its initialization.
But it isn't being used atm anyways.

Also, there seems to be a phantom “Level5Storyboard” floating about - you’ll notice, completing Level 4 properly goes to the first screen of that level, but nowhere does that storyboard actually exist. I have no idea why that could be, unless it's because I have another branch checked out elsewhere that DOES have that. It shouldn't matter once we put in Level 5 anyway.