Quality Control (qc) Command

 
Implementing qc command. pyflakes and pep8 are working OK. pylint option raises an error currently. TODO: Add function to git_tools.py to return list of files that have been modified. Us this function to implement '--changes' option and only run tests for modified modules.
Is there an rcfile for pyflakes as well as pylint? Might be good to be specific about what program the rcfile is for.