Returning seemingly-valid empty TopoJSON responses for any request
Moved vectiles bbox string construction down to Response object
Actually encoding non-multi geometries in vectiles to seemingly-valid TopoJSON
Substantial cleanup inside vectiles topojson_encode()
Merge branch 'master' into add-vectile-topojson

Conflicts:
	TileStache/Goodies/VecTiles/server.py
Corrected vectiles TopoJSON output with properties and GeometryCollection
Passing geographic bounds to VecTiles topojson_encode(), doing nothing with them for now
Generating TopoJSON transform for 512px vectiles and outputting integers
Added support for vectiles TopoJSON multigeometry types
Cleanup in topojson_encode()
Fixed MultiPolygon topojson encoding bug
Moved vectiles server.topojson_encode() to topojson.encode()
Added basic tests for vectiles GeoJSON
Added basic tests for vectiles TopoJSON
Cleaned up details in vectiles tests