New Story Autofocus

New story modal now autofocuses on the title when it appears. This
required a small modification to the focus directive, as with DOM
manipulation like modals, the popup elements are linked _before_ they
are added to the DOM, rather than after. Adding a minor timeout
fixed that.

Change-Id: I5cb0001c2afd991544bc40c33c3fcd6b89f8b208