added allowed hosts setting and tweaked others
Making maps a bit more awesome (addressing #5)

Switched from Google Maps to CloudMade maps with Leaflet (using the
marker cluster plugin).

Also updated the API to return GeoJSON by default and hooked that up to
the new maps.
couple of tweaks for #5 - still only getting first 5000 results.
Merge pull request #10 from stringfellow/maps

Switch from Google Maps to Leaflet + CloudMade tiles, and consume GeoJSON API
Merge pull request #2 from stringfellow/master

Merged changes from upstream.