Add main doc block
Add function plotting code

Wrap the code in a self-invoking function with access to the global context and jquery. Also link this file to our index file. Code for the function plotting comes from http://www.javascripted.net/faq/plotafunctiongraph.htm
Convert functions to object methods with constructor

Then create canvas DOM element and draw a sample graph with a sample function
Add setter function and use it for canvas id
Pull canvas and context setting out of draw function
Pass in canvas id to constructor
Add documentation and semicolons