Make sure all link types specified in a graph query actually exist
Add missing exceptions.
Pass through with_links
Add prototypical HAL/JSON rendering
Add a link from the web service root to the graph view
Add option to return a graph as a tree (though not implemented yet
Move items in graph to _embedded
mimetype → content_type (to remove deprecation warning)
Add support for updating dicts in FirstOf
Add test to make sure SourceDetailView.put is atomic (i.e. won't create Sources if some validation fails)