Hi again!

I read through your implementation and found that yours is way more elegant than mine in a few key areas.

I tried updating my own project with most of those ideas, while making the whole thing a bit friendlier for the user (and more easily extensible, in my opinion), so I thought I would drop it here, if it can be of some help.

Like your project, mine is still lacking a lot of features, and would greatly benefit from a deeper D3.js integration, but I would still like to hear your thoughts on how to take this whole idea a bit further.