Remove unused requires and includes
`TaskRunner` no longer formats output
Add quiet formatter
Use quiet formatter on cli options
Better output report
Use `wait2` instead of `wait` when waiting external process
Extract superclass of task executors
Add executors as inner classes
Add task related stuff as `Task`'s inner classes.
Remove wtf rubocop file
Rubocop fixes
Formatters as inner classes! Yay!
Rename `Adapters` to `Adapter`
Rubocop changes
Add full formatter
Fix formatter spec describes
Add `Formatter::Status`
Remove empty module definitions
Stash into extract superclass
Overhaul cli