Create mentor and mentor report models
Add mentors to nav bar
Add mentor activity to event
Add tests for activity
Removed duplication from Student and Mentor
Refactor Students & Mentors

Delete Feed controller and view. Add student and mentor partial. Render mentor and student using collections. Moved links to feed_path to students_path.
Add Mentor Reports.

Refactor MentorReport model. Move params formatting from the model to controller. Track changes in Activties.

Pending

Display MentorReports on Student.
Add Mentor Reports to students.