allow wysiwyg in widgets. update html widget with wysiwyg-advanced by default

So pretty much every client has asked for a WYSIWYG in the HTML widget. Normally I would copy the packaged html widget, rename it wysiwyg, and then add the wysiwyg partial to the widgets admin controller.

Here is the after:
![new-wysiwyg](https://f.cloud.github.com/assets/1425304/217619/26c02ca2-84f0-11e2-9760-37cabed59f4a.jpg)