Allow multiple maps
Allow embedded maps to appear at side

Add class parameter to map tag
Add classes side-map and side-map-right

Usage:
<map title="Map:example1" class="side-map"></map>
<map title="Map:example2" class="side-map-right side-map"></map>
Always assume map namespace when using map tag
Add edit state when mapedit parameter is set in url

This adds leaflet.draw.js to provide a map editing toolbar
Currently this doesn't save anywhere but is not surfaced in the
UI
Add featureGroupToGeoJSON method