lib/local.js
function selectMissing(missing, manifest, fn) {
  fn(null, manifest.filter(function(file) {
    return file && ~missing.indexOf(file.hash);
  }));
}
function selectMissing(missing, manifest, fn) {
  fn(null, manifest.filter(function(file) {
    return file && ~missing.indexOf(file.hash);
  }));
}
function selectMissing ( missing , manifest , fn ) { fn ( null , manifest . filter ( function ( file ) { return file && ~ missing . indexOf ( file . hash ) ; } ) ) ; }
Find the missing files from the manifest

@param {Array} missing
@param {Array} manifest
@param {Function} fn
Find the missing files from the manifest