comment parts in the OPF
add support for book with overridden titles
increase the drop area on nodes
cloning a book keeps the overridden title (or original if it was not overridden)
forgot to finish fixing the bigger dropzone
reduce number of reparses when dropping content
Merge branch 'master' into atc-fixes

Conflicts:
	scripts/views/workspace/sidebar/toc-branch.coffee
fixes disappearing ToC titles on load
fixes DnD onto chapters
Check if we should redirect to some other content in a model.

This allows a container object to redirect editing to some representative
object in the container. For example, the first module in a book.
Opening a book redirects to editing the first module in the book.
Merge branch 'master' into atc-fixes

Conflicts:
	scripts/gh-book/opf-file.coffee
Merged better file names wtih atc fixes
Merge remote-tracking branch 'origin/master' into open-first-module-with-book
When switching repos, open the first book on reload.
Merge remote-tracking branch 'origin/master' into open-first-module-with-book
Allow contextModel to be null.
hide repo specific ui elements on initial login page
add delete module ui that removes things from the nav
resset state of root editable to make work on subsequent activations