Hallo is leaving 'ui-droppable' on paragraph elements

[umeboshi2]

When editing a element with <p>'s, the 'ui-droppable' class is added to all paragraph elements, but not removed when the element is saved.

[umeboshi2]

It looks like image plugin is responsible.

https://github.com/bergie/hallo/blob/master/src/plugins/image/current.coffee#L32