Added missing static resources and migrations for tweaks to model changes
Fix migrations
Merge pull request #17 from timlinux/develop

Added missing static resources and migrations for tweaks to model change...
Fix hardcoded min max and default zoom
Merge pull request #18 from timlinux/develop

Fix hardcoded min max and default zoom
Fix validation of min and default zoom levels
Merge pull request #19 from timlinux/develop

Fix validation of min and default zoom levels
Better populating fields.
Fix merged conflict.
Set default value for max_zoom.