Retriggers of master are failing on Travis about hawkrest

[kumar303]

ok, I guess we need to pin everything in requirements/dev.txt to exact versions, including dependencies, and add --no-deps to the pip args

[edmorley]

I meant to add - I'm working on this locally at the moment, so unless I get stuck, I'm happy to fix this :-)

[edmorley]

django-nose 1.4.4 dropped support for Django <1.8 and added support for Django 1.10:
https://github.com/django-nose/django-nose/blob/master/changelog.rst

As such, if we want to add testing against Django 1.10 it would be much easier if we could just stop testing anything older than Django 1.8.

I know in #20 you wished to retain Django 1.6/1.7 support, however given more time has passed, and given that the only hawkrest users at Mozilla I can find (other than Treeherder, which is using Django 1.10 already) are the not recently maintained:
https://github.com/mozilla/apk-signer
https://github.com/mozilla/signing-service

...then I think we should just drop Django 1.6/1.7 support now.

[kumar303]

The APK signer is no longer in production and not maintained so I'm happy to drop <Django-1.8. We'll just have to remember to put it in the hawkrest changelog. Also, be sure to patch the docs: https://github.com/kumar303/hawkrest/blob/master/docs/index.rst#installation

Thanks for working on this!