Added button to the GradingRecords overview to send mail when updating projects.
Note that this will mail all the projects for which a record is available.
Added task to send out email for each processed GradingRecord.
If send_mail evaluates to True in the POST data for updateProjectsForSurveyGroup task then the results of every GradingRecord will be mailed to the Student. The Mentor and Org Admins will be cc'ed.