CT: resize canvas when resizing artpad
CT: Added Raphael and experimenting with namespaces
CT: Raphael needs a div rather than a canvas tag, doh!
CT: Add ability to draw a line
CT: Some refactoring
CT: Some more refactoring
CT: renaming variable to match intention
CT: still refactoring it to niceness
CT: adding some thickness to the line
CT: fix for when user drags pencil off the canvas
CT: tidy up
CT: adding some nice images