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.
Make breadcrumbs look like they are part of the main menu

..Will be going through other pages to add this to them too while
Adam fixes this since apparently a toddler is better at css then I am! :D