Updated app.js and .jade files to work with newer versions of nforce and...

... jade.

Jeff - I found your blog post that referenced this example nforce application very helpful in getting up to speed with nforce. I  fixed all the issues I ran into when stepping through each of the pages of the app. The issues were in 2 categories: changes to the signature of nforce functions and formatting and syntax issues in the jade templates. I hope you find these fixes helpful, and if you see anything that I've written poorly in the fixes, please let me know.
Cheers,
Lynn