Updated game view with button graphics and fixed constraint issues
Added correct game mode navigation from the main menu
Added video capabilities to the game engine.
Skip, replay and next problem all now perform as expected.

TODO: Expand on the problem manager to return more than just a dummy problem
Fixed bug where answer buttons wouldn't reappear on a restart of the problem
Game engine is now fully functional
Added the first 6 problems for face finder
Edited video description for billy dropping ice cream
Merge branch 'David-game-engine' into development

Conflicts:
	Social Solver/Social Solver.xcodeproj/project.pbxproj
Merge branch 'development' of https://github.com/cdegit/cmpt275-group9 into development