exit with code 1 on sigint
exit with code 1 on sigint

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