Adding garbage collection branch
Cleaning up interpreter, adding sample input for cons to be used in GC testing
Adding cons.p sample file
Refactor to remove unnecessary nesting during list creation, and per Prof.'s instruction on message boards, no longer eval lists at assignment time (however they are evalued during dump/display routines for help in debugging)
Improving debug output of interpreter
Adding car support (required to build garbage collector)
Merge branch 'GarbageCollection'

Conflicts:
	README.md
	interpreterext.py
Added simple test framework with makefile diff
Updated test instructions