expose a function to get the map for a given tile
expose a function to get the map for a given tile

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