added tests for goalStateReached()
tested that the goal state game config given in the project description returns true for the algorithm
tested that an obvious non-goal state game config returns false for the algorithm
fixed problem with equals() method
- first fixed up the test for the equals() method, which was using _assert()_ instead of _assertTrue()_ and failing because of that
- fixed up _equals()_ which was using _==_ to check the equality of two Strings
- changed the _clone()_ test to properly check for Game equality