function omit(keys, object){
  var ret = {};

  for (var item in object) {
    ret[item] = object[item];
  }

  for (var i = 0; i < keys.length; i++) {
    delete ret[keys[i]];
  }
  return ret;
}
Return a copy of the object without the specified keys.

@param {Array} keys
@param {Object} object
@return {Object}