Minute Interval for ActionDatePicker

Added (exposed) a minute interval option to use with the ActionDatePicker. I added an example using a time picker.

 In my example I'm *clamping* the time to the selected minute interval since I'm presetting the time according to the current date/date. I wasn't sure if I should bake this functionality straight into the ActionDatePicker so that it will automatically clamp the time if the minute interval is set.