code: public Parameters omit(String... paths) {
  		Parameters result = new Parameters(this);
  		for (String path : paths)
  			result.remove(path);
  		return result;
  	}
docs: Omits selected parameters from this Parameters and returns the rest as a new
  Parameters object.
  
  @param paths keys to be omitted from copying over to new Parameters.
  @return a new Parameters object.