dont use urlencoded() middleware

bodyParser does these three things:

app.use(express.json());
app.use(express.urlencoded());
app.use(express.multipart());

I haven't tracked down the *exact* cause, but I'm pretty close. In any
case the urlencoded() middleware breaks POSTs going through the proxy.

See https://github.com/kbaribeau/node-proxy-timeout-test
Merge pull request #38 from kbaribeau/master

Fix http post issue -- master