Merge branch 'release/v0.3.3' into develop
Add postgis testing (w/ failing tests)
Fix tests under postgres
Advise use if migration 0007 fails (fixes #27)
Generating tox in prep for Python3 work
Convert to Python 2 and 3 dual code base

tox tests against Python 2.7 and Python 3.4
South 0.7.x doesn't work with Python 3.4, so dropped
Add test for 100% branch coverage
Add python3 info to setup
Merge branch 'python3'