Merge pull request #8 from jhamrick/hotfix-version

Version 0.03.3
Update README.md

Include links to sphinx documentation, github repo, and pypi
Fix relative imports for Python 3
Fix zip() and xrange() for Python 3
Fix print statement for Python 3
Fix type checks for Python 3
Run Travis tests on Python 3
Add trove classifier for Python 3
Fix a couple more type checks from static analysis
Test on Python 3.3, not 3.2
Don't try to apt install python3-numpy for Travis.
Merge branch 'py3' of git://github.com/takluyver/dbtools into takluyver-py3