drawtick added
modified changing environment function
divided draw_tick into render_entity/environment
final commit for now, most functions implemented waiting on other classes to finish for further implementation
remove unneeded comment
GameView Updated
Merge pull request #22 from NintenJoe/Task-3.3

Task 3.3
Added Collision Detector tests
Added __repr__ and __init__ tests.
Removed unnecessary check in _objs_in()
Tweaked Collision Detector tests.
Added nonempty repr/str tests and fixed a bug in both functions.
Merge branch 'CollisionDetectorTests' of https://github.com/NintenJoe/zol into CollisionDetectorTests