Direct link to the v1.2.13 api docs gives 500 internal server error

[katranci]

Steps to re-produce:

1. Go to http://angularjs.org/
2. Open "Develop" drop-down and click on "API Reference"
3. Select "1.2.13" from the version drop-down
4. Open "Develop" drop-down and right-click on "API Reference" and click on "Open Link on New Tab"
5. You'll see 500 Internal Server Error page

[petebacondarwin]

The error is because the URL has a slash on the end. If you remove the slash all is well.
We should fix a rewrite on the server for this... @jeffbcross ?