Fold this into a package

It's generally considered unsafe to import one's own code at this point.  I've also had success using `ast` to parse the file and walk the nodes for an assignment to `__version__`, e.g.: https://github.com/modcloth-labs/loggly-pipe/blob/5130f00e71363a7cfbf68e60c3b9bc9fe1aecf5d/setup.py#L15-L24