Basic multiple select implementation
Added example

People have asked about getting the multiple selection container
to show for a single selection.  This is a basic example that shows
that it could easily be done now.
Header and footer decorators

Added examples of header and footer decorators.
Limit the explicit coupling between adapters
Clicking on a selected option triggers an unselect event
Small changes in preparation for more adapters
Added array adapter

This should add support for dynamically generated array data that
still works with a basic `<select>` element.
Trigger events when the dropdown opens and closes
Added very basic AJAX adapter