.toTime() method added

## toTime (integer)

    var temp = 134;
    console.log( temp.toTime() );     // outputs: 00:02:14
    console.log( temp.toTime(true) ); // outputs:     2:14 (compact
mode)

## toTime (string)

    var temp = "4543";
    console.log( temp.toTime() );     // outputs: 01:15:43
    console.log( temp.toTime(true) ); // outputs:  1:15:43 (compact
mode)