Update hyperkitty documentation
The documentation at https://hyperkitty.readthedocs.org/en/latest/development.html is outdated and needs to be updated. The documentation was written for Django-1.6/1.7 and current version is Django-1.9.
The documentation at https://hyperkitty.readthedocs.org/en/latest/development.html is outdated and needs to be updated. The documentation was written for Django-1.6/1.7 and current version is Django-1.9.