Order questions by created at
Implement undo.

Fixes #16
Add rake task for deleting old versions of paper_trail
We're undoing only delete
Disable paper_trail by default in tests
Improve tests, mostly part with uploaded files
Enable undoing deletion of image questions

Fixes #25.
Always .env if it exists
Validate uniqueness of quiz name inside a school.

Fixes #24.
Fix a spec
Fix a Rake task
Reorder Gemfile
Remove search box for now
Redirect from home if logged in
Fix a migration.

2abeb2935457ff691bdeb3dee598d4caf69065bd
Remove Bundler.require and remove some unused gems
Fix a mistake
Redirect to real root in logo
Enable PaperTrail after RSpec's suite
Make tests for redirection of home path