Removing config.json from the repository
Absolute assets are no longer prefixed with the application path
Actually removing config.json...
Passing previous and current value to event handlers when a change occurs
Implementing simple tab model.

* Tab has a string ID and an associated jQ-wrapped (set of) DOM
  element(s).
Rough tabbed editor implementation.

* Switches between fairly generic 'tabs', each of which has an
  associated DOM element containing its content.
* Implementation's a bit of a mess at present.
Implementing coordination between tab groups.

A new 'coordinator' ensures that only one of the registered viewers can
display a tab with a particular id at any one time.

The page load is a mess so it's not all beautiful out of the gate at the
moment, but with a bit of clicking the behaviour can be observed.