Add support for the tox test runner
Ignore *.bak files created by 2to3
Use print function instead of statement
Use 'x in y' instead of 'y.has_key(x)'
Add missing whitespace after comma
Add dependency on the 'six' library
Use 'isinstance(x, y)' instead of 'type(x) is y'
Replace unicode with six.text_type, and str with six.binary_type
Make dict functions work across Python 2 and 3
Use six.callable() to work on Python 3.0 and 3.1
Update to work with urllib structure in Python 3
Make list.sort() calls Python 3 compatible
Only decode string if not already unicode
Avoid use of cmp() which is gone in Python 3