Embed WebWork Into Iframe

The WebWork URLs should be entered into grapefruit like this:

http://webwork2.cs.rpi.edu/webwork2/myTestCourse/Orientation/
http://webwork2.cs.rpi.edu/webwork2/myTestCourse/MAAtutorial/
(etc)

Logs the user in as a guest on WebWork. Currently no functionality for tracking submitted answers.