mapbox/mapbox-studio — pull request #926 by GretaCB (2014-10-02 22:01:06+00:00)
Title: Gpx fix

addlayer function no longer checks the `metadata.json.vector_layers` array for layer names.

Instead, gets the actual Mapnik layer names from the `layers` array returned from `mapnik-omnivore`. And makes the layer.id cartocss friendly as needed.

cc @yhahn