Don't cache media when serving locally
remove superflous photos dimensions test
add failing test for saving image and updating dimension
upgrade django simpleimages version to fix dimension field bug
Merge pull request #268 from saulshanabrook/fix/resize-images

Fix saving image dimensions when resizing for thumbnails
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