code: function makeTree (aPath, mode) {
      return Q.nfcall(fs.mkdirs, aPath, { mode: mode })
    }
docs: Replacement for [q-io/fs#makeTree](http://documentup.com/kriskowal/q-io#maketreepath-mode)
  @param {string} aPath the directory to be created
  @param {number=} mode (e.g. 0644)