Added json to the game controller to pass response to js.

Fixed mistyping in the game initialization method that gave incorrect unique_piece_ids.
fixed misspelling in JS file that prevented response from being displayed.
Needed to pass the game_id as args into the empty_space? method and the opponent_in_jump_midpoint? methods.

Updated the method calls in the game controller to reflect the above changes.
Cleaned up an old, commented out piece of code.
Merge pull request #29 from heaphyg/testing_game_update_route

Testing game update route