Clicking a book changes the nav, clicking a Folder filters the workspace list

Clicking the "Add" button adds a piece of content to the Book/Folder
instead of just to the workspace
Merge branch 'atc' into prototype-context-sidebar
Adds labels to items in the "Add Item" dropdown
Added some styling from dak1
Load MathJax after the rest of the editor has loaded
Added the lastmodified time

This is updated on save instead of on every change
Merge pull request #17 from Connexions/add-item-titles

Adds labels to items in the "Add Item" dropdown
Vertically align the search toolbar
Merge branch 'atc' into modified-time
Merge branch 'atc' into load-mathjax-last
Moved MathJax for the index page as well
Merge branch 'load-mathjax-last' of https://github.com/Connexions/atc into load-mathjax-last
Added dependency to load jQuery before loading the human-dates plugin
Merge branch 'atc' into load-mathjax-last
Switched to using momentjs

Added dynamically updating the relative last modified time
Merge branch 'atc' into prototype-context-sidebar
Vertically align the search toolbar
Merge branch 'atc' into relative-time-momentjs
Update flexbox layout to work with Webkit and Firefox Nightly
Merge