resset content view between renders
refactor content pane styles when content is empty
allow deleting currently active module
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
Recover the spirit of 5f2700b3.
Deal with the event where a book is deleted.
fix deleting current module and current book
Merge pull request #119 from oerpub/59758184-allow-deleting-the-module-that-you-have-open

59758184 allow deleting the module that you have open