mapzen/TileStache — pull request #3 by hkrishna (2014-04-07 20:46:54+00:00)
Title: Extending multiprovider 

to handle requests that have a "+" in the path (separating individual layers for ex: /buildings+places+pois/123/132.json)

requires the config file to have a empty layer called "+" with class "TileStache.Goodies.VecTiles:MultiProvider" and empty names [].