Rewrote genes history function to better represent ace.
Added dead genes notification to overview

Squashed commit of the following:

commit c7bce8c4ad42e33314023e49a72bb77901f5d5ca
Author: JD Wong <jdmswong@wormbase.org>
Date:   Fri Apr 5 16:47:28 2013 -0400

    moved dead genes notification down a bit

commit 9e2f3ea4dd2ab21bc9b817ea44cc13f5ec8ab2a0
Author: JD Wong <jdmswong@wormbase.org>
Date:   Thu Apr 4 19:42:42 2013 -0400

    changed display of dead genes notifier in overview
Merge branch 'staging' of github.com:WormBase/website into staging