Add bootstrap
Add annotate gem
Add admin verification helper
Add validation of problem solution
Add newlines to problems form
Add admin verification to problems controller
Make discant executor receives solution and input
Add output to problem
fix typo
Add relations between submissions, problems and users
Add submission form
Add problem setter to problem
Make problems list the index
Add trunk8 to make readable large descriptions
Change redirect logic when user is not admin
Add customization to bootstrap
clean scaffolds styles
enhance submission form
enhance submissions#index
Enhance sign up form