"Static" link - with interface for static URL construction

[klokan]

We should add into services the "Static" link - with a link to an interface similar to:
http://heyman.github.io/leaflet-areaselect/example/

which would allow selection of the area of give size and location / zoom. This can be used to construct the Static API URL.

The component:
https://github.com/heyman/leaflet-areaselect/