ffmpeg2theora: head fix

The HEAD has moved (… About 2 years ago). Other changes to reflect the new HEAD, style tweaks, and an exceptionally simple test added.
Yeah, I thought about that after I committed heh. If build.stable? is a bit more clunky than it needs to be here. I'll turn this into a stable block later today when I'm at the Mac again.

Sent from my iPhone

> On 21 Oct 2014, at 05:17, Misty De Meo <notifications@github.com> wrote:
> 
> In Library/Formula/ffmpeg2theora.rb:
> 
> >  
> >    # Fixes build with ffmpeg 2.x by removing use of deprecated constant
> > -  patch do
> > -    url "http://git.xiph.org/?p=ffmpeg2theora.git;a=patch;h=d3435a6a83dc656379de9e6523ecf8d565da6ca6"
> > -    sha1 "5a3e48c386ac077ab58afa6c49631c88f8f85929"
> > +  if build.stable?
> Create a stable block with the url/sha1 and move this there instead.
> 
> —
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