navbar successfully populates (still doesn't work)
I don't get why this doesn't work.
toggle-tree collapsing works (thanks @akislyuk)
toggle tree works, recursively togled archives
port .nav-list CSS over from bootstrap 2.3.2
cleaning up erlenmeyer.css
nav header CSS fixes
put features back into working layout template
returned fancy HTML to layout.html
article summaries constrained to active articles
archive URLs work
set article container as nav id target