Ability to group nodes

[parthms]

Hey Nylen,

Firstly, I have to say, you have done an excellent job with the process map. Totally love it! I wanted to use the process map, but I also needed the functionality to group nodes together and be able to collapse/expand them on click.

Here is an example of what I want to add on top of your process map:
http://bl.ocks.org/GerHobbelt/3071239

Any guidance would be most helpful.

[nylen]

This is not something I've done before. It would likely require extensive code changes.