bootstrap tree
remove unused jquery-ui checkpoint
don't use $(document).append (it's wrong and broken)
use components jquery-ui
bootstrap dialogs
tree style tweaks
bootstrap button output area
ipython-main-app should be a bootstrap container
center login
use responsive bootstrap
tweak header
hide save status as it shrinks
add missing dialog.js
fix wrong arrow direction
disabile bootstrap's capitalized nav-header
tweak header styling

use nabbers, so they are internally consistent
set layout with outerHeight

jQuery changed what `height` means when border-box-sizing is active.  As of jQuery 1.8, `height` *always* means content-height.

[ref](http://blog.jquery.com/2012/08/16/jquery-1-8-box-sizing-width-csswidth-and-outerwidth/)
fix bad `$(body)`
only put the notebook in a container

allows pager to be full-width
add missing cell_type = "code";