Started nodulator implementation
Added node generation from uploaded images

Uploaded images will now be processed to generate an array of colourful
nodes ready for manipulation. Added a default picture to use.
Implemented drawing of nodes

call to draw nodes nested inside generation of nodes to avoid possible
issues with synchronisation; if not placed as callback in the
image.onload section then the nodes might be drawn before they have been
generate. This would be awkward.
Added Animation

Added animation (although nothing is moving yet) - this includes a shim
fro cross-browser use of requestAnimationFrame released under MIT
licence.

Jigged the canvas to take up most of the screen now- I think it looks
better.
Added touch and mouse listeners