Normalise r1 urls

To explain here, R1 had a _dynamic_ URL system ...

- http://arts.theguardian.com/critic/feature/0,,1159725,00.html
- http://arts.theguardian.com/critic/feature/0,,1159725,00123123.html
- http://arts.theguardian.com/critic/feature/0,,1159725,what-the-fucking-fuck!.html

So inbound links (Eg, from wikipedia etc.) often have some numbers attached to the URL. This pull request normalises the URLs so we can look them up in DynamoDB and S3 as strings (not patterns).

- http://www.theguardian.com/critic/feature/0,,1159725,.html

I've also added the tests back in after having to remove them due to permission problems.