Edit book metadata

[TomWoodward]

this is an extension of #18

and follows issue: oerpub/github-bookeditor#156

[kathi-fletcher]

OK -- This needs master merged in before I can test it.

[kathi-fletcher]

OK: I have done initial testing, just on the icon behavior and have put the issues that remain in a comment here: oerpub/github-bookeditor#156

I think we could live with the menu behavior (click to show) for now, and it might turn out finicky, so lets do it as a second stage.

[kathi-fletcher]

• Fixed stuff in New TOC and Shelf icons for consistency, efficiency, and metadata editing github-bookeditor#156 other than the hover behavior
• In the editing dialog, change "Close" to "Close without saving" and add "Close and save".
• In the cancel message that comes up, it is critical to not have the crazy double negative "I am canceling my cancel.".
• Change the message to say "Are you sure you want to close without saving?", to make it completely clear what the "Cancel" message refers to.

There are some other bugs that Max and I have found, but I think we should get this stuff ready, merge, and then treat those as bugs.

[kathi-fletcher]

OK -- I found one major bug and made an issue for it. (Whole editor reloads if you click on the -> of an already opened module.

And then one book division opening scneario didn't work. I put that on the issue - oerpub/github-bookeditor#156 .

Will merge now so we can move forward.