Enable dynamic loading of node bodies

There is current work around loading full node views in place from clicks on teasers.

All dynamic loading to date is block-specific. Either we attach to blocks or we load blocks.

For nodes, we probably need to follow what's done in e.g. activeedit. There, we have a separate module .inc file for each module's implementations.

We already have a hook_dynamicload() to work off, invoked in dynamicload_footer(). So, presumably, we should put node loading into a file /modules/node.inc in the dynamicload directory, to be loaded with a call to jstools_modules_includes('dynamicload').

node.inc would look something like this:

/**
 * @file
 * Enable AJAX-based loading of node elements.
 */

/**
 * Implementation of hook_dynamicload().
 */
function node_dynamicload() {
  $items = array();
  $items[] = 
    'selector' => 'a.node_read_more',
    [further data here]
  );
  return $items;
}

We would also need some way to specify where/when this behaviour should attach, as it's not likely site admins will want it on every node list.