Squashed commit of the following:

commit c1e8db5b1185e0931b7cad78778ffb30c254f991
Author: Wayne Graham <wayne.graham@virginia.edu>
Date:   Thu Sep 26 11:53:13 2013 -0400

    geoserver 2.4.0

    http://blog.geoserver.org/2013/09/20/geoserver-2-4-released/
Merge branch 'update_geoserver' of github.com:waynegraham/homebrew into update_geoserver