added routes for Course TAs
added index,changed routes,working on the controller
removed unnecessary file , added changes to  index file
fixed logic for the insertion
added flash , catching exceptions when trying to add TA twice
Slight changes to the view
fixed the button bug, added documentation,woked on indentation.
removed unnecessary javascript
changed routes
resolving conflicts
removed unprofessional message
adding notifications
fixing documentation
fixing indentation
fixing indentation
fixing indentation
fixing indentation
fixing conflicts with master
fixing indentation
fixing indentation