Increase zoom levels for Google Satellite maps to 21.
Note: requires this patch to the Leaflet JS library as well: https://www.drupal.org/node/2452921#comment-9727527
In summary: change "maxZoom: 18" to "maxZoom: 21" in file sites/all/libraries/leaflet/leaflet.js
Added API description + example.
Added Security items.
Changes since 7.x-1.0:
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