0.4.1, 7/28/2013 -- First stable release.
0.4.2, 7/28/2013 -- Added a README.txt for Contributers and Thank-yous.
0.4.2.1, 7/28/2013 -- README.rst modifications for public pypi release, bumped dependency version reqs.
0.4.3, 7/28/2013 -- Minor bugfix in extraction metrics.
0.4.3.1, 7/29/2013 -- Reduced version req for numpy from 1.7 to 1.6.2
