Add call to 2to3 to do basic conversions.
Python3 requires the use of the implementer decorator instead of implements
In Python 3, the 'message' atrribute on exceptions is removed. The 'args' attribute has been around since at least 2.5, though.
Python3 prints out old-style classes (like DummyResource) differently
Merge pull request #2 from pib/python3

Fixes to support Python 3 - thanks a lot @pib :)