Merge tag '0.1.15'

release 0.1.15

upgrade to South 1.0 as preparation for Django 1.7 upgrade
move migrations to south_migrations (#38)
update all dependencies besides Django (#38)
exclude south_migrations from coverage reports (#38)
switch to Django 1.7 (resolves #38)

* add initial migration for caffeine app
* remove South from settings
* add TEST_RUNNER to settings to fix test runner compatibility warning
* bump Django dependency to 1.7
* drop South dependency
* replace abandoned django-registration with django-registration-redux
bump version, adapt docs to sphinxcontrib.httpdomain change
Merge branch 'release/0.1.16' into live