[split] Move django plugin to oh-my-fish/plugin-django

https://github.com/oh-my-fish/plugin-django

plugins/django/djtest.fish

-# time, cleanup pyc and running test, settings as first argument
-# e.g. djtest settings_dev
-function djtest
-  set VERBOSE --verbosity=1
-  find . -name "*.pyc" -delete
-
-  if set -q argv
-    time python manage.py test $VERBOSE --settings=$argv
-  else
-    time python manage.py test $VERBOSE
-  end
-end