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
add title to new module's file names
use pretty titles for things when creating books
update copy on title prompt when adding things
remove italics-related styling for quotations

This is intended to go with a96f157d7997d70eee1a223c26da0463187fab1d on
the branch of the same name in Aloha-Editor
fixes DnD onto chapters
let semantic blocks scroll with content (github-bookeditor half)

This needs to go with fe7c4ad00bb29ca5e1fa84d52549cb26e43888af on
Aloha-Editor
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
Merge pull request #76 from oerpub/58657378-boxes-and-spacing

remove italics-related styling for quotations
Merge pull request #77 from oerpub/semantics-drag-below-fold-57739880

let semantic blocks scroll with content (github-bookeditor half)
improve header styling

Remove the borders, use better sizes, don't let letter-spacing inherit
past h1, use same margins as paragraphs.

Forthcoming (though I think relatively nondependent) commit coming on
Aloha-Editor