iBug 964928 - Code new version of Firefox Nightly First Run page

As per https://github.com/mozilla/bedrock/pull/1740

this is the following commits for Bug 924928 squashed.

- mhoye

Squashed commit of the following:

commit bc124abe08a6501e60e54dfcf412084537220e28
Merge: f05861d b6ce84d
Author: Mike Hoye <mhoye@mozilla.com>
Date:   Tue Mar 4 13:56:54 2014 -0500

    Your daily update process.

    Merge branch 'master' of https://github.com/mozilla/bedrock

commit f05861dc134a01cc8c4efa1fd72e4e3f9acacd77
Author: Mike Hoye <mhoye@mozilla.com>
Date:   Fri Feb 28 15:29:36 2014 -0500

    Reshuffling some links, adding Call To Action.

    Cutting down the number of links on the page, shuffling some others and
    adding a call to action at the bottom.

    - mhoye

commit f959bfa54cf593f47b426b672d5514197efb4edf
Author: Mike Hoye <mhoye@mozilla.com>
Date:   Thu Feb 27 14:05:20 2014 -0500

    A revision to nightly_firstrun.html

    I suppose it's possible I got this right this time. This modernizes the
    currently-unused nightly firstrun page in preparation for our turning it
    back on, with dead links and video removed and new links that do better
    things added.

    - mhoye

commit 48ccabdc572f32efc610bfe220c8e0ad8cb70bc5
Author: Mike Hoye <mhoye@mozilla.com>
Date:   Thu Feb 27 13:06:43 2014 -0500

    Firefox Nightly page, modernized For Your Enjoyment.

    Haha, that last one was just a vim swapfile because I'm Very Special.

    Here's the real changes.

    Again - removing dead links and outdated video, adding in the modern
    links and onramps.

    - mhoye

commit 8af24dcb5991306eef84e23e089faba23febe174
Author: Mike Hoye <mhoye@mozilla.com>
Date:   Thu Feb 27 12:18:25 2014 -0500

    Bringing the Firefox Nighty page up to speed, culling dead links and
    video, adding in modernity. Needs string localization work.

    - mhoye