Added toplevel Makefile
Added toplevel Makefile

CMU-CREATE-Lab/timemachine-creator,CMU-CREATE-Lab/timemachine-creator,CMU-CREATE-Lab/timemachine-creator,CMU-CREATE-Lab/timemachine-creator,CMU-CREATE-Lab/timemachine-creator,CMU-CREATE-Lab/timemachine-creator,CMU-CREATE-Lab/timemachine-creator,CMU-CREATE-Lab/timemachine-creator,CMU-CREATE-Lab/timemachine-creator,CMU-CREATE-Lab/timemachine-creator