[FFe] New screenshots for Ubuntu installer slideshow

[Dylan McCall]

This is a freeze exception request for one last update to
ubiquity-slideshow-ubuntu, including new screenshots for the Ubuntu
slideshow.

This is pretty straight-forward: previously, screenshots shown in the
installer were from an older version of Ubuntu. Now, they're from
12.04. And they're a little more consistent, too :)

You can see a preview slideshow with new screenshots over here:
http://people.ubuntu.com/~dylanmccall/ubiquity-slideshow-ubuntu/preview/
(You might need to Shift+Refresh if you've looked at that before,
because browser caching is crazy and stuff).

I apologize that this took so long to happen. I wasn't expecting the
wallpaper to arrive when it did.

I am not intending to make any changes with this release except for
the screenshots.


Exception request in Launchpad:
https://bugs.launchpad.net/ubuntu/+source/ubiquity-slideshow-ubuntu/+bug/982109


Thank you!

Dylan