Update Leaflet 0.6.2 -> 0.7.2
Added wellknown.js for parsing WKT to geoJSON
Produce Leaflet Layers for POIs on the Model

For shapes this means parsing the WKT then creating geoJSON layers
MapView delegates Leaflet layer creation to the POI

also s/markers/features as we have POLYGONS, MULTIPOLYGONS and POINTS
Added wellknown.js
Added wellknown.js to requires
wellknown.js exports parse
Merge branch 'master' of github.com:ox-it/maps.ox