Re-Organized, Added Missing Files, Added HW06-07

Moved source code into sub-directories, added untracked files from stuycs-apcs-z
hw repo

Added HW06---quickselect algorithm
Added HW07---quicksort algorithm
Merge branch 'zamansky-cs2' of github.com:archaephyrryx/hw into zamansky-cs2

Conflicts:
	Makefile