Added more tests to the games controller, model, and request specs.
Completed the TODOs:
-Changed winner? to winner which returns winning player or nil
-Used 'top left' instead of (0,0) to identify button.
-Added testing for games#show with invalid params
-Added tests for games#update
Merge pull request #2 from sumaiya/master

Added more tests to the games controller, model, and request specs.