Adds stamen maps
custom basemap icon
Merge branch 'master' into CDB-4360
Updates zoom levels and Terrain warning
uses the available_basemaps config
Adds test
CDB-4360 Add flags for Here/Stamen basemaps
adds migration to set the map flags to true
Merge pull request #895 from CartoDB/CDB-4360

Adds stamen basemaps and two flags to control the nokia & stamen basemps in the dropdown