update the URL for new folders
clear dirty bit on folder save
make a pointer when dropping to folder
Merge branch 'master' into atc-new-url-for-folder

Conflicts:
	scripts/gh-book/toc-pointer-node.coffee
	scripts/models/content/book.coffee
Merge branch 'master' into atc-new-url-for-folder
Merge pull request #96 from oerpub/atc-new-url-for-folder

assorted Folder updates (Should not affect gh-book; depends on PRs)