Show nearby restrooms

This fixes #103.

Here’s a screenshot of the appearance:
![google chromescreensnapz001](https://cloud.githubusercontent.com/assets/43280/2620512/85118134-bc3f-11e3-9c2f-f4c75add5f6f.png)

The styling could be improved, and maybe the radius should be shorter than for a default search, but it works as a start.