Addition of South 1.0 usage and requirements
Addition of South 1.0 usage and requirements

Clarifies #101
For Django 1.6,  South version 1.0 or newer is required to properly install this library.
django-silk/silk,jazzband/silk,django-silk/silk,mtford90/silk,crunchr/silk,mtford90/silk,mtford90/silk,django-silk/silk,crunchr/silk,django-silk/silk,crunchr/silk,jazzband/silk,jazzband/silk,crunchr/silk,jazzband/silk,mtford90/silk