v0.4.0 (2018-04-11)

Added

• init command takes multiple stages through the --stage flag.
• init command prompts for stages during initialization if they are not
  provided.
• init command writes the stages to the public.json configuration file.
• var:del, var:set and var:tag commands will now operate on multiple
  stages through the --stage flag.
• var:del, var:set and var:tag commands will a add a stage provided by
  the --stage flag to the public.json configuration file if it is not
  already present.

Changed

• var:del, var:set and var:tag commands no longer take a positional
  STAGE argument.