fix equals method
fix equals method

Jgilhuly/VoogaSalad,Jgilhuly/VoogaSalad,keikumata/CS308_Tower_Defense,brandonnchoii/VOOGASalad,keikumata/CS308_Tower_Defense,brandonnchoii/VOOGASalad,PinPinx/TD_Game_Engine,ninasun/game_engine,jeremydanielfox/game_engine,ninasun/game_engine,jeremydanielfox/game_engine,PinPinx/TD_Game_Engine