Adds support for a "sites" directory.
Adds a wrapper around dom-content-loaded-hook.
Code refactoring; gives each callback its own jquery object.
Adds foreach() and nonempty fields to Maybe objects.
Uses dom-content-loaded hook wrapper.
Replaces inIframe method with enterIframe.
Refactoring; adds various keyboard commands.
Adds onSubtreeMutation method.
Adds a couple of example sites.