Ensure polygons are counter clock wise

[nmondollot]

The GeoJSON spec says that polygons should be counter clock wise (more info here).

We currently don't enforce this.
When a polygon is saved as clock wise, edited in a GeoJSON tool (like geojson.io) and imported back in the database, the polygon coordinates are changed although the polygon is essentially the same => this creates noise (which is especially visible in the import UI).

Solution: ensure polygons are counter clock wise for the Boulder model.

Previous attempt: 39cc8e6
=> let's make the code simpler / test it, or just wait for rgeo to support the feature out of the box.

In the meantime we can run this query:

Boulder.where("ST_IsPolygonCW(polygon::geometry) = true").update_all("polygon = ST_ForcePolygonCCW(polygon::geometry)")