Update README
Add google analytics to project
Add node toggling logic based on children status

The idea is that if the descendants have all been either fully
completed or not even started, we don't want to display them. We
instead display only those sub-trees where the children are being
actively worked on.

Also refactored json blobs to be more git-friendly instead of being
all on one line.
Add tooltips to concept tree

Includes removal of event listeners in jquery for all of those nodes.
Fix wrong knowledge tree scores being displayed