change user creation to superuser for admin

instead of creating user without specific permissions, it will now
create a superuser in the admin when reseting the app

otherwise, any time a permission is added it needs to be specifically
added to the admin user, which is time consuming and easy to forget to
do
Merge pull request #270 from saulshanabrook/fix/reset-user-all-permissions

change user creation to superuser for admin (fixes #258)