Node lists rewrite

[justinbmeyer]

This

• Fixes Items pushed on lists don't get removed from the DOM in some cases #605 and adds a test for it
• Makes some substantial changes to how nodeLists operates
• Changes the location of node_lists.js
• Includes a lot of improved inline documentation.

A nodeList now knows about its parent and child node lists so it is able to update them more effectively.

[daffl]

Why a new PR? #614 was up to date, too?

[justinbmeyer]

I didn't include deadeab and I wanted to make sure you didn't merge while I was still working on it.