Update pep8 to 1.5.7

This is just to keep us on the upgrade treadmill. ([Changelog](https://pypi.python.org/pypi/pep8#changelog))
@jzoldak They actually *are* indented, it's just difficult to see that because the string itself starts with whitespace that makes it appear more indented than it actually is. Perhaps this code should be refactored to be more clear -- but I don't think that needs to happen in this pull request.