professor messaging infra structure
adding course to ProfessorMessage
viewsets for professor message
missing send_mail import
Merge branch 'master' into professormessages
adding validation to professor message serializers
Merge branch 'master' into professormessages
Merge branch 'master' into professormessages
email templates no banco
Merge branch 'master' into professormessages
php activities rules
Merge branch 'master' into professormessages

Conflicts:
	timtec/urls.py
initial files for messages angular module
partial implementation off professor messages
javascript refactor
make references from ProfessorMessage to users instead CourseProfessors and CourseStudents
message detail and messages list working
fix pipeline js confs and pep8 issues
Merge branch 'master' into professormessages

Conflicts:
	core/models.py
added checklist-model to bower dependencies