Urls

Hey dude, this removes the double slashes from urls and fixes the tests, here is what I found:

It's still failing, but in another place where I'm sure you can figure it out. It's trying to retrieve an item that does not exist.

Anyway, here were the issues I found:

1. You really needed to login with u1 because django @requires_auth wasn't allowing it to get to your view.

2. In HttpResponseRedirect the content is empty, so I had to check if the response contained the header location and if it had the word "denied"

3. Last (this was just a detail that I'm sure you'd find out if you managed to pass through the login part) you were trying to make u1 share it's own lists. Which was working of course. I had to change to u2's lists.

Anything you find awkward feel free to comment.