Now using Flask for routing; added metadata path to tabix bakend
home now 404s and requirements are abc123
Merge pull request #45 from hershman/flaskify-squash

Refactor Werkzeug requirement into flask
Update setup.py to prepare for pypi release.

Includes switching the minimum version of setuptools to 0.7.

This is still a fairly arbitrary line in the sand, but it's a very early one.
As/if we discover any issues with versions this old, we will increase the
minimum version.