Benchmark (with docs) for Socks5 proxy

![image](https://cloud.githubusercontent.com/assets/4954150/4410799/e1c487a0-44e8-11e4-83ba-8af8ff0985fc.png)

Currently detects the data channel limit bug.
So, this is in tsd. I know this will be a pain while we still have separate repos (sorry) but let's use tsd for this.

In `uproxy-lib`:

* `cd third_party`
* `tsd query node --action install`

(We could also maintain a separate tsd folder in this repo but then it gets hard to merge the two tsd folders from the two repos......argh).