Update setup to shut up warnings
Bump version to 0.1.2
setup: use setuptools for packaging

So we may have a chance that installing it works :)
Bump version to 0.1.3
treewidget: remove commentend logging settings
setup: make it explicit we need django-mptt
widgets: reuse mptt helpers for serializing the tree

This is done to reduce code and not performance reasons.
widgets: remove hardcoded url attribute

No need for it
README: Update requirements