Update the downloads UI.

Squashed commit of the following:

commit fea7d676210836b0b56e9a996006d88e3ac7780a
Author: Adam Harvey <aharvey@php.net>
Date:   Thu Nov 21 13:13:41 2013 -0800

    Fix the heading selector when dropping the Stable text.

commit 49d0d166ed06083f51de2901344223e8bed61342
Author: Adam Harvey <aharvey@php.net>
Date:   Thu Nov 21 13:09:49 2013 -0800

    Fix borders.

commit 7041fbf6ebad84023398a3e78734c1c76eaf4f34
Author: Adam Harvey <aharvey@php.net>
Date:   Thu Nov 21 13:06:21 2013 -0800

    Further tinkering.

commit 651a57b6f7b93b56cddd477cbf1d66743cfb18f7
Author: Adam Harvey <aharvey@php.net>
Date:   Thu Nov 21 12:36:23 2013 -0800

    Tinker with the downloads page.