Add a finish() method to the editor which is called after the
editing completes by submit or cancel. None of the built in
editors use the method.

Set cache-control header for iOS 6 bug.
Change the example div to pre since that works better on
ie6-8 (even though on my vista machine it is fine with div's).

Script also changes from pre to div in edit mode since
you are not allowed most elements inside a pre.

Make the two warning messages a bit more noticable, especially if
they occur together.

Improve wording of warn/notice messages.