middleman/middleman — pull request #650 by tdreyno (2012-10-24 22:22:25+00:00)
Title: Make Sitemap metadata queryable with arel-style API

Super excited about this. I ported `document_mapper` to our Sitemap.

Check out this API:

```
sitemap.where(:tags.include => "homepage").order_by(:priority)
```