Add the leaflet stylesheet.
Use Mustache for templating.
Use CKAN templating coding standards.
Merge branch 'master' into leaflet
Pass zxy params to the tile handler.
Attempt to return the png file as binary.
Use StringIO to prevent image -> string -> image and associated truncation.
Make requests for tiles and grids to CKAN rather than directly to windshaft.
Implement the routing of the utfgrids via CKAN too.

Albeit the SQL parameter passing will need to be modified!
Fix documentation and comment.
Filter the map images by the department that we're viewing.
Leave a reminder to remove this.
Add some helpers for the SQL wrangling.
Build the sql query using sqlalchemy
Don't pass SQL to the tile method.
Pass the filters as a serialized string, and implement term filters for tiles.
Search against arbitrary field names.
Support filtering by geometry in tile queries.
Add leaflet.draw
Add terraformer for the wkt serializer.