Update AUTHORS and changelog.
Bump version for 1.1.0 release.
Added tag v1.1.0 for changeset 16f0d9bd172c
Bump version for dev.
Update tox.ini for newer Django versions; drop Python 2.5 and Django 1.3.
Add Django 1.6 branch to tox.
Add a CONTRIBUTING.rst doc.
Add links to source code to CONTRIBUTING.rst and add to sdist.