made pw package w/ object class
added unit test
objects list manipulation functions
ray.py w/out calculation code. updates to object.py and stat.py
messed around w/ imports
messed with levels. wrote some calculate() in ray.py
made physicsworld run (not integrated)
got rid of changed files
Got physicsworld mostly working
fixed circle collision
fixed double variable
started intergration
fixed readme
integrated w/ game module
cleaned up some code. got pw intergreated
test
made objects know when they're hit by laser
cleaned up enemy.py
very dodgy implementation of enemy killing
improved enemy deletion a tiny bit