Release 0.7.1

Just making a temporary PR for the release I'm going to put out today. I've also added a develop branch so we can use the [git-flow](http://nvie.com/posts/a-successful-git-branching-model/) workflow.

I've made some minor tweaks to setup.py, and I've added support for Coveralls so we can get info about our test coverage.

Also, @davidressman, I changed the author on PyPI to myself, since I've contributed more code and I'm interested in actively maintaining this. Hope that's not a problem!

I'll probably get some readthedocs documentation setup before too long too.