add fix so new Modules are added properly to the Workspace
resset content view between renders
refactor content pane styles when content is empty
allow deleting currently active module
TocPointerNode.getRoot() returns the OPF file instead of the EPUBContainer
Implement simple migration view.

This includes a table migration as well, for removing captions on tables.
look up the root node when calling addChild
merge from master
Add a slight delay for dragging to start.

A quarter of a second avoids that irritating problem where things are
accidentally dragged into another chapter.
update version of less
fix adding a new book. no longer throws an error
disable save when new book is added
When the editor view closes, destroy the editor.

Otherwise Aloha.editables grows with stale editors.
When editor is loaded, place cursor at top so things work immediately.
Update aloha's selection object after cursor placement.
Merge remote-tracking branch 'origin/master' into 59758184-allow-deleting-the-module-that-you-have-open

Conflicts:
	scripts/views/workspace/sidebar/toc-branch.coffee
	templates/workspace/sidebar/toc-branch.html
Resize behaviour was removed in 8d2bed53, but the empty event handler is still repeatly added to the window.
Recover the spirit of 5f2700b3.
Deal with the event where a book is deleted.
fix: do not mark book as dirty when it is selected