Added unit tests for djblets.auth.views.register
Changes for latest revision

Change 1:

Created new templates for testing: base.html and register.html.

This was to ensure that the render function within views.py could use a

template when running the test cases. 
Change 2:

Added url to view mapping for djblets/auth/register so that the url could be

used for http requests (get/post) to test responses. In previous revisions, RequestFactory

was used, and the function register() from views.py was directly called within the test cases.
Change 3:

Used Django's test client instead of RequestFactory. This ensures that the register view actually

works as intended when its mapped url is called (rather than calling register() directly.

When register receives an http request that is not a POST request
When register receives a POST request, but an invalid form is passed
When register receives a POST request and a valid form is passed