fix(timepicker): format input values on blur

[pkozlowski-opensource]

Fixes #511

[wesleycho]

So this doesn't really format on blur as far as I can tell, but on the change output. Is that sufficient? As far as I can tell, this theoretically shouldn't change anything.

Also, should this use the input output if we go the output route? Or do we need to use (blur)?

[pkozlowski-opensource]

So this doesn't really format on blur as far as I can tell, but on the change output

That's the intention. I can change the commit message.

Is that sufficient? As far as I can tell, this theoretically shouldn't change anything.

Actually it changes everything :-) So far we were using ngModel which updates on input (each key stroke). This PR changes to the reaction to the change event (user "done" editing - in case of input fields it is equivalent to blur).

Also, should this use the input output if we go the output route?

Not sure what you mean here...