remove django 1.5 from travis.yml

we don't support django 1.5 at the moment
small typo fix
Prefix django fields

This way they won't override something in already in custom data
with the same name. Some small code cleanups
small code cleanups

use hrefs for fetching stormpaths accounts when possible.
add our own permission mixin

for now it doesn't do anything
make sure to sync sp groups as well

when a user authenticates make sure to sync
stormpath groups to the local database. this includes
global groups and the groups that the user belongs to.
add ability to add/remove groups for user

Works from the admin interface as well.