Added Makefile to allow running tests from the top-level dir.
Added Makefile to allow running tests from the top-level dir.

Also, added the ability to clean the directory by removing all *.pyc files,
which uncovered a latent bug whereby we forgot to rename an import of a module
after a file rename, but which continued to work due to a stale *.pyc file for
the previous name of the module.

mbrukman/cloud-launcher,mbrukman/cloud-launcher,mbrukman/cloud-launcher,mbrukman/cloud-launcher