Add URL-based sample command to tilebatch
Add URL-based sample command to tilebatch

Norkart/tilelive.js,tomhughes/tilelive.js,nyurik/tilelive.js,topwood/tilelive,paulovieira/tilelive,mapbox/tilelive.js,mapbox/tilelive,kyroskoh/tilelive,gravitystorm/tilelive.js