Fix typo
Fix #146: Support running tests with python setup.py test.

Removes dependency on Fabric.
Add a small JS API.

Adds a global variable to browserid.js (django_browserid) that has 3
useful methods: login and logout for manually triggering BrowserID,
and isUserAuthenticated for checking if the current user is 
authenticated.
Merge remote-tracking branch 'origin/master' into mozilla_branding