router.js
* @module greppy/app/worker/middleware/router
* @author Hermann Mayer <hermann.mayer92@gmail.com>
var RouterMiddleware = function()
* Append the router middleware to the given application stack.
* @param {Object} app - Application to configure
* @param {function} callback - Function to call on finish
RouterMiddleware.prototype.configure = function(app, callback)