code: function aliasByDictionary (obj, aliases) {
    for (var key in aliases) {
      if (undefined === obj[key]) continue;
      obj[aliases[key]] = obj[key];
      delete obj[key];
    }
    return obj;
  }
docs: Convert the keys in an `obj` using a dictionary of `aliases`.
  
  @param {Object} obj
  @param {Object} aliases