project:clean can be local only
Add --yes and --no options, replacing --no-interaction.

Replace 'dialog' with 'question' throughout.
Provide a more stable 'branch' command.
Merge pull request #128 from pjcdawkins/clean-local

project:clean should be local
Limit environment IDs to 32 chars.
Make the drush command recognize the custom alias name.
Merge branch 'fix-branch-wait' into mine
Merge branch 'yes-no' into mine