django-widgy update to django 1.6

I am not sure where you all are with this yet.

Fixed depreciation of urls.defaults in demo: https://docs.djangoproject.com/en/dev/internals/deprecation/#id3

Fixed south migration issue: https://code.djangoproject.com/ticket/21312

Waiting on mezzanine to get to Django 1.6: 
Recent: https://groups.google.com/forum/#!topic/mezzanine-users/W4nF9nr-HtA
@gavinwahl issue: https://github.com/stephenmcd/mezzanine/issues/745