starting chapter 6.3

http://techbus.safaribooksonline.com/book/web-design-and-development/9781449340223/1dot-introduction/id788090#X2ludGVybmFsX0h0bWxWaWV3P3htbGlkPTk3ODE0NDkzNDAyMjMlMkZpZDg2NjY3MyZxdWVyeT0=
starting 6.4
Done chapter 6 - making a bar chart
factored barchart into makebarchart function
done making a scatterplot
encapsulated examples inot samples object
done for now