With the Python 2.7 deadline fast approaching, modernize the codebase
making use of the modernize module to switch to using six, as well as
other upcoming features, such as absolute imports . Stop using 2to3
for Travis, yay!
Continue my crusade to running flake8 against new contributions by
cleaning up whitespace (and wierdly, the entire indentation of
Migration) to silence most flake8 warnings. AllTests is the remaining
outlier, and requires some thought on how to approach.
Steve Kowalik