Update underscore & citeproc.js, add backbone.js

citeproc => 1.0.466
underscore => 1.4.4
backbone => 1.0.0
Optimize & add to  note serializer

This was not exactly premature-- there were a massive number of joins on
each query because we weren't selecting related documents/notes to note
sections. This should make that constant.

Maybe instead of doing that here, it should be done with custom managers
for each type of note section. I dunno.
Start implementing backbone view for note admin

Rendering works at this point, but not editing.