Email on enroll/un-enroll actions

Optionally email students on enroll/un-enroll actions
by instructor from enrollment tab in LMS.

CHANGELOG.rst

@@ -152,3 +152,5 @@ Common: Updated CodeJail.
 
 Common: Allow setting of authentication session cookie name.
 
+LMS: Option to email students when enroll/un-enroll them.
+

common/djangoapps/terrain/factories.py

@@ -44,7 +44,7 @@ class GroupFactory(sf.GroupFactory):
 
 
 @world.absorb
-class CourseEnrollmentAllowedFactory(sf.CourseEnrollmentAllowed):
+class CourseEnrollmentAllowedFactory(sf.CourseEnrollmentAllowedFactory):
     """
     Users allowed to enroll in the course outside of the usual window
     """

lms/templates/courseware/instructor_dashboard.html

@@ -382,6 +382,8 @@ function goto( mode)
   <p>Enroll or un-enroll one or many students: enter emails, separated by new lines or commas;</p>
   <textarea rows="6" cols="70" name="multiple_students"></textarea>
   <p>
+  <input type="checkbox" name="email_students"> Notify students by email
+  <p>
   <input type="checkbox" name="auto_enroll"> Auto-enroll students when they activate
   <input type="submit" name="action" value="Enroll multiple students">
   <p>

lms/templates/emails/enroll_email_allowedmessage.txt

+Dear student,
+
+You have been invited to join ${course_id} at ${site_name} by a member of the course staff.
+
+To finish your registration, please visit ${registration_url} and fill out the registration form.
+% if auto_enroll:
+Once you have registered and activated your account, you will see ${course_id} listed on your dashboard.
+% else:
+Once you have registered and activated your account, visit ${course_url} to join the course.
+% endif
+
+----
+This email was automatically sent from ${site_name} to ${email_address}
\ No newline at end of file

lms/templates/emails/enroll_email_allowedsubject.txt

+You have been invited to register for ${course_id}
\ No newline at end of file

lms/templates/emails/enroll_email_enrolledmessage.txt

+Dear ${first_name} ${last_name}
+
+You have been enrolled in ${course_id} at ${site_name} by a member of the course staff. The course should now appear on your ${site_name} dashboard.
+
+To start accessing course materials, please visit ${course_url}
+
+----
+This email was automatically sent from ${site_name} to ${first_name} ${last_name}
\ No newline at end of file

lms/templates/emails/enroll_email_enrolledsubject.txt

+You have been enrolled in ${course_id}
\ No newline at end of file

lms/templates/emails/unenroll_email_allowedmessage.txt

+Dear Student,
+
+You have been un-enrolled from course ${course_id} by a member of the course staff. Please disregard the invitation previously sent.
+
+----
+This email was automatically sent from ${site_name} to ${email_address}
\ No newline at end of file

lms/templates/emails/unenroll_email_enrolledmessage.txt

+Dear ${first_name} ${last_name}
+
+You have been un-enrolled in ${course_id} at ${site_name} by a member of the course staff. The course will no longer appear on your ${site_name} dashboard.
+
+Your other courses have not been affected.
+
+----
+This email was automatically sent from  ${site_name} to ${first_name} ${last_name}
\ No newline at end of file

lms/templates/emails/unenroll_email_subject.txt

+You have been un-enrolled from ${course_id}
\ No newline at end of file