incorporate new uw-editor

[mandolyte]

Describe what your pull request addresses

• [ ] Issue 67

Test Instructions

• [ ] Open a book
• [ ] Close it (no warning should appear since you have not made any changes yet)
• [ ] Re-open
• [ ] Re-open again
• [ ] Observe the popup message saying that it is already open
• [ ] Make a change
• [ ] Observe that save button is enabled
• [ ] Close without saving
• [ ] Dialog warning should appear
• [ ] Click Cancel
• [ ] The book should remain on-screen with changes
• [ ] Close without saving again
• [ ] this time click continue
• [ ] the book should go away
• [ ] re-open the book
• [ ] book should open and save button should be enabled (this is not the case for current version) Done.

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