#4 VisualAid support broken

[Ted Rust]

Forms are not shown whether guides are turned on or off. Worse than that, files are saved with the class="mceVisualAid" attribute intact.

I wrote a hacky solution:

ed.onPostProcess.add(function(ed, o) {
o.content = o.content.replace(/\bclass="mceVisualAid"/g, '');
});

Works for now. Don't know enough about the visual aid stuff to fix it for real. (Yet.)