Refactor

[anandthakker]

I think a scene really wants to an ast-like thing that can be evaluated, given coordinates for its free points, into a concrete array of (coordinate) geometry objects, which can in turn be easily rendered. #2 is part of this, but not all of it. Plan:

• euclid-scene: the models & ast-building interface
• euclid-draw: evaluate a Euclidean geometry scene down to coordinate geometry pieces. The output here should allow for a mapping between the incoming nodes and the resulting items. Also, this needs a better name... and euclid-descartes is probably too cute for its own good.
• euclid-render-svg: render. use a vdom approach here.

Question:

• What's the simplest & cleanest way to handle styles/classes?