Adapted from: https://github.com/cloudfoundry/bytefmt/blob/fb0928873a0334aee5c6e02e2ba435357e4296fb/bytes.go.

Runs a tool in the given environment and with the provided args.

Taken and modified from: https://raw.githubusercontent.com/mitchellh/go-wordwrap/master/wordwrap.go.

A flag is a simple redirect to a raw flag.

A group returns a command that is populated with subcommands.

Just to make collections of flags a litte easier to deal with.

The standard command handler (basically, we just inject an environment).

A tool returns a runnable app.