added badges to readme
removed unused columns from the dataset (stored in the response_set)
protect dataset attributes from mass assignment
redirect to user to dashboard on start_questionnaire error rather than dataset
refactored start_questionnaire slightly, removed unreachable redirect, trimmed down code slightly
corrected dataset user assignment
added stub questionnaire for easier testing
added note about GB stub version
User dashboard
User resources
Fix dashboard tests
Set up new routes for certificates
Allow fetching of certificate through dataset
Controller logic for show action
Change links for certificate show action
Add pry gem
Tweak tests to match new routes
Add specific :certificate_with_dataset factory, and remove dataset association from :response_set

This broke the tests
Add routes for a dataset's latest certificate
Make link for requirements cleaner