Modify the app and router implementation, so that the middleware is
executed in order defined by phases.
Predefined phases: 'init', 'routes', 'files', 'final'
Methods defined via `app.use`, `app.route` and friends are executed
as the first thing in 'routes' phase.
API usage:
// get a Phase object
app.phase('init');
// register middleware handlers in a phase
app.phase('init').before(handler);
app.phase('init').use(handler);
app.phase('init').after(errorHandler);
// regular handler
function handler(req, res, next) {
// do stuff
next();
}
// error handler
function errorHandler(err, req, res, next) {
// handle error and/or call next
next(err);
}
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