Fixed mass assignment for 5 models.

./app/models/deliverable.rb:36 - protect mass assignment
./app/models/deliverable_attachment.rb:1 - protect mass assignment
./app/models/faculty_assignment.rb:1 - protect mass assignment
./app/models/team.rb:1 - protect mass assignment
./app/models/team_assignment.rb:1 - protect mass assignment
Merge branch 'mass_assignment'