Allow for image creation

[dmadisetti]

I think it would be pretty cool if we could allow people to make their own images, maybe we can use something like: http://literallycanvas.com/

This is pretty cool demo without the react dep: http://www.williammalone.com/articles/create-html5-canvas-javascript-drawing-app/#demo-outline

We should somehow make it obvious whether the image should be exported for circle of rectangle, and show the clip regions.

We could then export to the library here: #23