Fix broken link to PPA

Thought I'd pass this along, since I didn't look for the PPA at all after the link, and ended up building gflags and libgit from source elsewhere. The PPA was much better. :smile: Thanks!

Might be worth mentioning that I also had to `go get` `github.com/golang/glog`, `github.com/bmizerany/pat`, and `code.google.com/p/go.net/websocket` for the web interface to work after a clean golang 1.2.1 install. (the error messages were fairly verbose and lucid though). Not sure if this has something to do with the go version, or just more dependencies.