code: function _requireFile(requirable, directory) {
      var required;
      try{
        var res = resolve.sync(requirable, { basedir: directory});
        required = require(res);
      }
      catch(err) {
        required = (void 0);
      }
      return required;
    }
docs: Attempt to fetch the supplied filename, no exceptions on fail
  @private
  @param {string} requirable to try and require
  @param {string} [directory] - directory to attempt resolving filename path with
  @returns {*} the result of the require, undefined if not found