A map widget for place pages.

Since I'm not geared up to convert the XML to HTML, I can't fully test
it. The map appears under the place description, 180px high and full
width.

Depends on a fix for #67, the GeoJSON is currently incorrect.
Merge pull request #86 from srophe/issue12

A map widget for place pages.
Houston, we have maps, now that I've regenerated.