Run 2to3 and extra other fixes.
All tests are green on python3
Add the failing test for the broken sanitize
100% compatibility between python 2.7 and 3.3
Try to enable travis builds
Forgot to add it
Backport the new test requirements
Backport the new test requirements
Complete removal of the HTML sanitizer and the html5lib dependency
Merge with master
Mark python 3 as a supported language