TSD behind corporate proxy

I'm trying to use tsd behind a corporate proxy. Using windows and the github "git bash" client.

```
$ tsd query jquery -a install

>> tsd 0.5.6 (beta)

stream.js:94
      throw er; // Unhandled stream error in pipe.
            ^
Error: connect ETIMEDOUT
    at errnoException (net.js:904:11)
    at Object.afterConnect [as oncomplete] (net.js:895:19)
```

It would be nice to be able to use tsd : )
