username and email request for lti module

Necessary for MIT course starting early October. Please merge as soon as possible to facilitate feature testing.

added username and email functionality, so that username and email can be passed to the lti third party app
We wanted users to be presented with a message indicating that their e-mail/username would be sent to a third party application. When "Open in new Page" is not selected, the tool automatically appears without any user action. Given that we only need the LTI info from new pages, and we wanted user confirmation, this seemed like the simplest option.