add student email to all proctor requests

* Use params for GET calls and data for POST
request access from the proctor automatically in is_released()

The proctor server's status call now additionally returns whether the
problem has been requested or not. If it's not been requested yet the
proctor xmodule now automatically submits a request on behalf of the
user. This completely skips the 'request access' page when MIT card
integration is active.