Upgrade Express examples to Express 4.0

[shapeshed]

Currently the examples run against Express 3.x

[jadechip]

Hello there, I just bought the book and I'm really really enjoying, I love the style of teaching, it really clicks with me and I've been able to understand a lot. However, I would like to know if and when the examples will be updated to Express 4.0 and Twitter's new API.
Many thanks...