added cohort_participant model
added cancan roles
added roles upon sign in
Merge branch 'devise_forms' of https://github.com/Brandon-Lyons/NSS-student-engagement-app into mentors
added temporary sign up
Add pages controller; minor styling additions
Merge branch 'mentors' of https://github.com/Brandon-Lyons/NSS-student-engagement-app into devise_forms

Conflicts:
	config/routes.rb
Add Bootstrap gem; delete bootstrap files; add JQuery UI