add verdantdocs app and Document model
add documents index page
Add 'add document' view
add RelatedDocuments inline to NewsItem, and tweak panel construction so that the RelatedDocument model can supply them
abstract out common behaviour of BasePageChooserPanel and BaseImageChooserPanel into an abstract BaseChooserPanel
Refactor shared template code between page_chooser_panel and image_chooser_panel into a common chooser_panel parent template
implement document chooser
Merge branch 'documents'