New sector navigation interface

Squashed commit of the following:

commit 1446082f9f0e0e10f372e13b20d7907fed6dc612
Author: James Weiner <james.weiner@digital.cabinet-office.gov.uk>
Date:   Tue Jun 12 16:48:35 2012 +0100

    Re-positioned expand-collapse arrows

commit ea4dcc00664c1e5fdd7f084d024cf8ca889b5778
Author: James Weiner <james.weiner@digital.cabinet-office.gov.uk>
Date:   Tue Jun 12 16:35:48 2012 +0100

    Completed browse and search UI

commit ebfc01df26e444736d5d3f9f7aed54b3bbf40826
Author: James Weiner <james.weiner@digital.cabinet-office.gov.uk>
Date:   Tue Jun 12 16:35:33 2012 +0100

    made javascript target the browse container as well as the search one when it makes add links

commit d68bd1f51d826501ab080cc6b3e2ef55b93976dd
Author: James Weiner <james.weiner@digital.cabinet-office.gov.uk>
Date:   Tue Jun 12 16:32:43 2012 +0100

    Added image folder with placeholder expand-collapse arrow

commit d4069dfd85bc1ba70cab608afaae07f659b3396d
Author: James Weiner <james.weiner@digital.cabinet-office.gov.uk>
Date:   Tue Jun 12 13:14:17 2012 +0100

    Tons of updates to layout to make it clearer

commit a0896a807bca566909b0a78ca7ec8dc7d49c2c27
Author: James Weiner <james.weiner@digital.cabinet-office.gov.uk>
Date:   Mon Jun 11 17:21:46 2012 +0000

    Added ability to put a class on particular pages. Added a start-page class to the start page so we can target it so we can leave room for the related box for instance

commit a04f3964670947ab966de9b06cd991028cd83c56
Author: Bradley Wright <bradley.wright@digital.cabinet-office.gov.uk>
Date:   Mon Jun 11 14:55:47 2012 +0100

    Automatically scroll the page if the list is off-page

    This adds a jQuery filter called "bottom-offscreen", which is used like:

      $('#element').is(':bottom-offscreen')

    and will scroll to the top of the page automatically if the
    just-expanded list will have some items off the bottom of the screen.

commit ea02f09a428a3bfa5560b1c83de30cae5e8bb4ec
Author: Bradley Wright <bradley.wright@digital.cabinet-office.gov.uk>
Date:   Mon Jun 11 14:54:09 2012 +0100

    Fix stylings a bit

commit ba0fa8b6003bca69a0a82113304a384af4db347c
Author: Bradley Wright <bradley.wright@digital.cabinet-office.gov.uk>
Date:   Mon Jun 11 13:33:27 2012 +0100

    Position add links and nested lists a bit better

commit 96654f4ae23644ad4c2b5b58e1d35c0463027032
Author: Bradley Wright <bradley.wright@digital.cabinet-office.gov.uk>
Date:   Mon Jun 11 12:08:18 2012 +0100

    Stop following close links

commit 306f4586a4ea9566707658ae9eb1cad25f1ad138
Author: Bradley Wright <bradley.wright@digital.cabinet-office.gov.uk>
Date:   Mon Jun 11 11:59:41 2012 +0100

    Add first pass at nested open/close browsing widget

commit 7d111d283519c9ae76087ef00d0f50b688bcd777
Author: Bradley Wright <bradley.wright@digital.cabinet-office.gov.uk>
Date:   Mon Jun 11 10:58:23 2012 +0100

    Coding style

commit 9c00e8817f2ba41bbc9db29ec928c5d38996c6dc
Author: Bradley Wright <bradley.wright@digital.cabinet-office.gov.uk>
Date:   Mon Jun 11 10:58:15 2012 +0100

    Add page_title content block

commit 908efb888e19aba01bec5e6ea3af389e32b87a2e
Author: Bradley Wright <bradley.wright@digital.cabinet-office.gov.uk>
Date:   Mon Jun 11 10:57:56 2012 +0100

    Go full width for Licence Finder