updates to book metadata editing

[TomWoodward]

No description provided.

[kathi-fletcher]

Testing checklist:

Opf file

• Don't want a new book to be "based on anything". <meta property="schema:isBasedOnUrl">http://github.com/oerpub/empty-book/content/empty-book.opf</meta>. If the repo the book is in is forked from somewhere, then this field should be set to the original repo.
• ID is empty: <dc:identifier id="uid"/> This should be the URL to the repo. We have this as the .opf file right now.
• When creating a new shelf, we need to the metadata editing widget to come up.

-Nav file

• Meta tags need closing. <meta itemprop="inLanguage" content="en">

[kathi-fletcher]

OK -- Three of the four things are improved. I never get the metadata to pop up when I create a new shelf, either from the login page or from "change shelf". I am going to make a separate issue for it and we can come back after module metadata and video.

Also, I realized while testing that forking really doesn't do right by metadata, but that is going to be a whole nother set of details to get right. I will get them written up, but doubt we will try to tackle them.

The id is fine for now. It isn't a URL as originally requested.