Probe ports before trying to listen on them.

[garthk]

Fixes #4

[garthk]

Whoa, there. Screwed up nicely.

[garthk]

Much better.

Atonement: test script to camp port 8080.

#!/usr/bin/env node 
var http = require('http');
http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Port 8080 camped. Bwa ha ha!\n');
}).listen(8080, '127.0.0.1');
console.log('Server camping port 8080.');

After only ten minutes' return to Python, semicolons look odd.