Merge pull request #1 from khushkaran/master

Added devise gem to fix warden name error
added spec/views
problem model added
Changed problems to requests, added spec
Added requests model, controller, index
Added Teacher Devise model
Added domain regex
Added teacher dashboard
Redirect to Github sign in
Redirects to Dashboard on teacher login
Can create requests
Display requests
Added Cohort creation
Added Bootstrap
Switched from pages controller to students controller
Merge pull request #2 from khushkaran/teacher

Teacher Feature Monday Week 1
timestamp added to requests
First ever merge as a group
Merge pull request #3 from alexgaudiosi/master

Added problems model
Added Navbar and front page prototyping content