write empty file to simulate corrupt data rather than the string 'bogus data' which triggers a libzip segfault - refs https://github.com/springmeyer/node-zipfile/issues/33
write empty file to simulate corrupt data rather than the string 'bogus data' which triggers a libzip segfault - refs https://github.com/springmeyer/node-zipfile/issues/33

mapbox/millstone,BHare1985/millstone,CartoDB/millstone