Make use of PolyModel for Works, Documents, etc. Add some (but not all) of
the missing Models related to Documents. Refactor site settings to be useful
for any "/home" page view. Make the resulting home settings store a reference
to the Document, rather than looking up the Document by a hard-code key name.
This is to set the stage for Document editing being generic, and then being
able to select from some existing documents which one to use as the "/home"
static content. This makes it possible to pre-edit several Documents, have
them Reviewed, and then quickly change the "/home" page content as a setting,
rather than editing the Document in the settings form (though settings forms
might still embed the current document into their form for convenience).
Patch by: Todd Larsen
Review by: Pawel Solyga
Review URL: http://codereviews.googleopensourceprograms.com/1001
# test settings file with no errors
foo = 3
bar = foo