Version package and friendly name

Things addressed in this PR:

1. Dashes in a module or package name are bad news; can't import easily (definitely not the way it is shown in the docs).
2. I needed to change setup.py to fix the above. It is convention to leave your packaging files (setup.py, etc) in the repo and keep them versioned. I pulled it from the PyPI tarball.
3. mixpanel.alias is pointing at the wrong endpoint. Through trial-and-error, I found that it should point to /track.