title: React: Don't use keyUp for onChange events
body: <p>Is it possible to have React fire the <code>onChange</code> event after the focus on an element is lost as opposed to having it on <code>keyUp</code> (currently, <code>onChange</code> is an abstraction of any event that manipulates the field value)? <code>keyUp</code> is a little slow for me, and I think it may help the mobile expereince with what I'm building to switch the firing of that to after the field is focused.</p>