Lift audio blacklist from Safari 6.1+

Safari 6.0 has some sort of problem where it hangs when
running the Vorbis audio decoding ... unless the debug
console is open, which disables the JIT compiler. :P

This doesn't happen in Safari 6.1 prerelease seed, which
will hopefully soon be replacing 6.0 in peoples' software
updates.

Safari 7 on OS X 10.9 is also known good.
Merge branch 'master' of github.com:brion/ogv.js