Add Makefile command for creating a virtualenv with virtualenvwrapper.
Fix distutils, PyPI, and pip packaging configuration files.

 * Remove/replace old classifiers in PyPI configuration PKG-INFO.
 * Add pip requirements.txt file for documentation builds on readthedocs.org.
 * Fix package build variables in distutils setup.py.
Update .gitignore.
Bump because minor version because we've rewritten large chunks of the codebase.
Merge branch 'fix/update-packaging' into develop