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
Merge branch 'bookish-only' into epub-only
Minor reordering to add book to ALL_CONTENT after everything else is initialized
Merge branch 'bookish-only' into epub-only
Updated models to use navTreeRoot

instead of navTreeStr
Added tests from dev branch