remove course certification creation, moved to course_certification signal

courses/models.py

@@ -318,20 +318,6 @@ class CourseStudent(models.Model):
     def save(self, *args, **kwargs):
         super(CourseStudent, self).save(*args, **kwargs)
 
-        # TODO Move this to Course Certification app, couse this app must not depend on Course Certification.
-        # try:
-        #     receipt = CourseCertification.objects.get(course_student=self)
-        # except CourseCertification.DoesNotExist:
-        #     from base64 import urlsafe_b64encode as ub64
-        #     from hashlib import sha1
-        #     from time import time
-        #     h = ub64(sha1(str(time()) + self.user.last_name.encode('utf-8')).digest()[0:6])
-        #     receipt = CourseCertification(course_student=self,
-        #                                   course=self.course,
-        #                                   type=CourseCertification.TYPES[0][0],
-        #                                   is_valid=True, link_hash=h)
-        #     receipt.save()
-
     @property
     def units_done(self):
         return StudentProgress.objects.exclude(complete=None) \