Install Fedora Button for LiveCD

[Chris Lumens]

> Yesterday night I noticed an IRC conversation on #fedora-desktop
> about this, and suggested that an actual window would be a lot
> better than a notification.
> Kalev, Matthias and the people there agreed with me, so I went
> ahead and wrote some code that does just that [1].
>  Screenshots can be found here [2] [3].
> I showed this today to Matthias and other people in the RH office,
> and the reception was good; people agree it's a good improvement over the
> proposed notification for F17.
> The text in the window comes from the result of this thread's discussion.
> 
> What do you think?
> 
> [1] https://github.com/cosimoc/fedora-welcome
> [2] http://i.imgur.com/8vRcO.png
> [3] http://i.imgur.com/gF0UJ.png

Yeah, this looks really well done.  Shall we pull it into the anaconda
git tree for F17?

- Chris