[Datetimepicker] update the input as you choose date, hour, minute

[Frozen-byte]

Bug, feature request, or proposal:

There is no way to detect human inputs made to the Datetime-Picker Dialog until he clicked through all three pickers (date -> timeHour -> timeMinutes)

In most Cases the timeHour selection is enough, when I close the panel after hour Selection the input stays empty.

What is the expected behavior?

I'd like to open the Datetime-Picker:

1. only choose a date
2. click outside the dialog
3. see the selected Date in the input-field (hour and minute to 00:00) 3.1) an EventEmitter I can subscribe to for each user Selection made

What is the current behavior?

When I close the dialog, without stepping through all pickers the input stays empty.

What are the steps to reproduce?

see above

What is the use-case or motivation for changing an existing behavior?

Golden Rule: Always minimize the clicks in frontend.

Which versions of Angular, MD2, OS, browsers are affected?

"@angular/core": "4.4.4", "md2": "0.0.29"