Expose request object for configuration of superagent

[wejendorp]

Makes the superagent handles extendible via plugins. I use this for forcing superagent.Request.prototype._withCredentials = true in order to make the models work cross origin.

[yields]

+1 i do this in a different component, but it's hackish.

[wejendorp]

How have you done that?

[yields]

i monkey patched superagent directly.

lib/model

patch(require('superagent'));
module.exports = require('model');