revise OS X relay instructions

We don't offer the vidalia bundle for OSX any more, therefore the https://www.torproject.org/docs/tor-doc-relay.html.en are wrong for Macs. Best options appear to be TBB open all the time, or homebrew recipes like https://github.com/mtigas/homebrew-tor

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information