Initial Drag and Drop functionality from workspace into a book
Updated file organization, removed glyphicons
Book editor updates when content in it updates
If loading fails trigger the error event
Added Save button and listeners when "dirty"
Changed mediaType to match cnx
Workspace is now a singleton so implementations can hook in easier
Fixed Firebug scrollTo problem
Clean up sign-in/out a bit
New content gets an id ('_NEW:*') so it can be added to a book

When the id updates on save the book updates its reference
Added ability to get the main layout
Added Note to Aloha toolbar
Updated custom layout to work with new version of Marionette
Enable dropping a module into a collection in the Search Results
Cleaned up styling of Drag and Drop elements
Book editor rerenders even if the TOC does not change

structurally. This is so events can properly bind to the DOM element
Added special models for book navigation
Added overriding titles in the UI
Enable saving when book structure changes
Minor reordering to add book to ALL_CONTENT after everything else is initialized