Allow any OSM tileserver to be used.
Allow a MapBox API key to be specified
Updated README to explain how to use a different OSM tileserver
Linked to a list of tile hosting services instead of going oer eacone individually
Allow any OSM tileserver to be used.
Allow a MapBox API key to be specified
Updated README to explain how to use a different OSM tileserver
Linked to a list of tile hosting services instead of going oer eacone individually