Django 1.7 compatibility

fixed: test runner
More info https://docs.djangoproject.com/en/dev/releases/1.7/\#standalone-scripts

Django 1.7 compatibility

fixed .travis.yml

fixed tests runner
pip no longer supports the --use-mirrors

fix: check django version

fixed .travis.yml
Add commas to a string

fixed travis config

fixed travis config

fixed travis config
Merge pull request #29 from yurtaev/django-1.7

Django 1.7 compatibility