add leaflet for map rendering
JS to just show a base map to start
relax CSP to allow OSM images
Using OS OpenSpace in OSGB36
add os map data in leaflet
change js location
change js location
fix asset path typo
moving js assets
updated map.js for BNG GeoJSON
Corrected GeoJSON
Red GeoJSON polygons, attempt at centering view
disable zoom and drag on map
define controls consistently
use extent from data
dont animate the fitBounds
remove popup
Merge remote-tracking branch 'origin/master' into add-extent-map

Conflicts:
	propertyfrontend/server.py
put map-specific JS in a separate include
fix tests