Hack in missing paramiko dependencies.

Paramikojs was never tested outside of Fire{SSH,FTP}, I guess.

See https://github.com/mimecuvalo/paramikojs/issues/5
First reverse engineering of SSHClient()

It is missing reading of data, which seems.. convoluted.
Reading the original paramiko code didn't help here,
because the [original paramiko code](https://github.com/paramiko/paramiko/blob/bade24d2d5b76c3f38bf0310ea8072184ab95b2a/paramiko/client.py#L245) simply
makes a normal--blocking--socket and doesn't need to deal with async.
Paramikojs negotiates with ssh!

It doesn't get all the way because of dependency problems, which I'm fixing one by one.
I had to temporarily use WebSockify's base64 mode for this, [even though I patched that](https://github.com/kousu/websockify/commit/f345e4e86af9bc23bf2470d31688eeefa10f0f54),
since it seems there is a bug in my patch that tricks Firefox into reading payload as header,
in the case of large payload.

For some reason, nodejs's "ws" module does not react the same, even with identical code (see `plain.html`).
Is Firefox more restrictive? Probably. I will need to dig through packet traces to figure out what's up.