finished up to coords_valid? test
finished through to the last test
solutions for week0
correcting a typo in the tests - blue should be a string (not a symbol) to match the string stored in the game object
correcting Game object initialization... lack of board data was causing the #check_for_winner test to fail
passes at least a couple 'check winner' test cases
finished existing Game tests & refactored check_ methods. renamed diagonal method to diagonal_right
updated master to have no solutions
Merge pull request #2 from kjersten/master

Correction to Game model and tests
fixed bug in check_for_winner & added diagonal-left checking
adding diagonal_left method in mixin
added test cases for in_progress, tie, and diagonal_left
some test changes
Merge remote-tracking branch 'upstream/master' into week0
removing total hack from game_spec now that it's fixed