adding minMinutes, maxMinutes, minHours and maxHours options (modify .js...

This commit add new sample options: minMinutes, maxMinutes, minHours and maxHours.

As the names suggest, this allows user to define the minimum and the maximum values displayed on the picker for minutes and hours.

Default are set to:
* minMinutes: 0
* maxMinutes: 59
* minHours: 0
* maxHours: 23