Added background images and started styling text.
Improved menu aesthetics, including adding a wide rectangular frame and computer mascot.
Improved spam mini game aesthetics.
Deleted password mini game view controller, since we haven't been using it.
Moved the mini game's call to completeMiniGameWithSuccess to a completion block so it runs after the view controller is dismissed.
Added proper image buttons.
Merge branch 'feature-level-buttons' into feature-basic-aesthetics
Made the two buttons on the level view controller properly styled image buttons.
Merge pull request #36 from zsweedyk/feature-basic-aesthetics

Improved aesthetics, including spam mini game