Allow Zoom Configuration on Leaflet Map

[justin0mcateer]

Currently AutoZoom (zoom to bounding) is enabled in the LeafletMap control. We have a use case for one particular view where we only want to render a single data point. In this case, the map zooms to the configured maxZoom (20), which is far to tight to be of any value. Either being able to control/configure the maxZoom (via property) or being able to disable the autoZoom function would allow simple workarounds to this problem.