Feature specs
Add timecop gem
Use Timecop in test environment
Clockwork Tomato example csv files
Fix example export file paths in feature specs
Add spec/support/invalid_file
Importer specs
Basic Pomodoro model spec
rails g model pomodoro
Fix pomodoro factory
Add :too_long_duration trait to pomodoro factory
Add time_diff gem
Pomodoro#duration
Change pomodoro spec
Pomodoro#duration validation
Importer singleton
EmptyImporter singleton
Fix importer spec
ClockworkTomatoImporter singleton
Fix importers spec