farhadi/html5sortable — pull request #28 by flying-sheep (2012-10-08 11:44:48+00:00)
Title: during ‘destroy’, remove event handlers added with ‘.on('sortupdate', …)’

when adding event listeners, i’d expect `.sortable('destroy')` to destroy them.

since jQuery’s recommended way of adding/removing event listeners is with `on`/`off` i did it that way.