[Sparkle] Stable Sparkle branch

[Jeff Hokit]

>
> From my perspective as a Sparkle client, cutting a new stable branch
> would be the best way to do that... Having
> to just pick a revision number from head and hope that it's stable,
> without having any idea at all of whether or not it's had any
> real-world use, negates a lot of that.
>
> -Stuart

Couldn't agree more with Stuart. I'd love to see a stable, identified  
build of Sparkle 1.2 (or 1.5, or whatever version the short term  
builds are heading toward).

  - Jeff