Add grading files and comments.
graded p1, p2.
Finish grading.
Finalize grading.
Update ps02/RatPolyCalculator/Classes/RatPoly.m
Final grading.
update grade.
Update ps03/GRADING.txt
Update ps03/Game/Game/GameObject.m
Update ps03/Game/Game/GamePig.m
Update ps03/GRADING.txt
ps04 grading.
ps05-grading
ps05 grading.
Update grade.
-5 for not threading game logic & UI.
fix total grade.
Merge branch 'ps01-grading'

Conflicts:
	Overlaps.m
	PERectangle.m
Merge branch 'ps02-grading'
Merge branch 'ps03-grading'

Conflicts:
	ps03/Game/Game/GameObject.m