Successfully attach media

Integration with Drupal’s core upload functionality- ability to successfully attach media attaching it to the core upload form element.

Current issues:
* ahah was working from another form, rather than rebuilding/appending the current.
* the add button is currently missing.
* need to refactor ahah to use model at http://katbailey.net/blog/katherine/the-dual-aspect-of-drupal-forms-and-...