Eliminate the Work.abstract property and move the Document.content property to Work.content instead. Update affected views, and re-base some classes that were deriving from Document just to get Document.content to now be derived from Work instead. The Document class now has a "pass" body with no additional properties. It is debatable whether Work should become Document, since I am not sure that we plan to be able to generically display, say, a Quiz or a Question (which are Works) on the home page (which can only specifically display a Document, or now, the basic Work entity...). Patch by: Todd Larsen Review by: to-be-reviewed

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"Todd Larsen" <tlarsen@google.com>
"Chen Lunpeng" <forever.clp@gmail.com>
"Sverre Rabbelier" <sverre@rabbelier.nl>
"Pawel Solyga" <pawel.solyga@gmail.com>