Add tests
Add tests

* it_calls__str__
* _it_calls_get_direction
* it_calls_getbelow
* it_calls_getabove
* it_calls_getleft
* it_calls_getright
* it_calls_getaboveleft
* it_calls_getaboveright
* it_calls_getbelowleft
* it_calls_getbelowright

jhogan/epiphany-py,jhogan/commonpy