Adds package.json, install dependencies with npm install -d

[ciaranj]

Hi, Just started working through your book, came to the first node example, and needed to work out your dependencies. Not a biggy, but may help someone less familiar with express/node :)

[mamund]

@ciaranj

Thanks for the pull request. Yes, I messed up and failed to work up package files. I'm at OSCON this week, but hope to review this in a day or two.

Thanks again.

[ciaranj]

np... also There appeared to be an errata in the source code an excess '/maze/' in the site attribute.. but I've moved on to the JSON examples now :)

[c4milo]

any update :)?