Add tests around existing Node.js code

[sunilj0lly]

I'd recommend using Mocha.hs and Should.js.
Logic around the graphs and percentage calculations would be the most important place to start.

[sunilj0lly]

I made a start on this but hit several problems with the current set up and also with trying to stub out Mongoose Virtual Properties.
https://github.com/sunilj0lly/Wibble/tree/mocha-tests

Documented the problems and possible solutions here:
https://docs.google.com/a/specialmoves.com/document/d/1_H5VizBhf9LcPYGX6-ANNZy3JYI2gAcu55KXhcnBz34/edit