ConfigPagesView now allows for creating a custom models and views for

the configuration page, along with custom options/attributes. These will

be outputted in the template when setting up the page.
A new template tag, json_dumps_items, helps to output data without

messing around with more expensive and messy template-based loops.

Used a custom model for the ConfigPagesView subclass, and passed data to it

and the view.
Made use of the new template tag with empty and full payloads.