Change indentation to 4 spaces for HTML and 2 spaces for CoffeeScript
Demo: add a 2nd multiple select + clean JS a bit + fix 'getSelectionOrder' return value
Retrieving the Chosen container no more relies only on ID

Fix issue #1.
Remove the "id" attributes in the demo.
Add functions to retrieve the Chosen UI container without any ID, for
both jQuery and PrototypeJs.
Add an error message when the Chosen container is unreachable.