Allow extended options to be passed to qs library

[Drarok]

This allows the options such as arrayLimit and delimiter to be passed to the qs library.

app.use('/path', bodyParser.urlencoded({
  extended: {
    arrayLimit: 0,
    delimiter: ';'
  }
}));

The main benefit of this is that setting arrayLimit to 0 causes arrays to be represented as objects, allowing "sparse" arrays like the following:

// foo[0]=1&foo[5]=hello
{ foo: { 0: 1, 5: "hello" } }

[Drarok]

Tests pass locally, the error on Travis appears to be a timeout?

[dougwilson]

Tests pass locally, the error on Travis appears to be a timeout?

Seems to be some subtle change in the latest patch version of on-finished i.r.t Node.js 0.8. I'm' taking a look.

[fatfisz]

We could allow all the other options, like allowDots, to be set too. Could I take over this?

[dougwilson]

Because the qs module is officially been abandoned, we are going to switch to a different library, so we don't want to expose any options to qs through our API, otherwise we cannot easily switch to an alternative.