Remove base64-related logic from Map class.
Remove base64-related logic from Map class.

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