Feature request: add --cleanup option to brew cask install

[kdeldycke]

Description of feature/enhancement

The feature consist in adding a --cleanup parameter to brew cask install, which will remove all temporary assets like downloads, once a package is successfully installed or upgraded.

This will mirrors the same --cleanup option from vanilla Homebrew.

This feature seems to depends on the completion of #23398 (ex-#21763).

Justification

This feature helps to keep a system clean and tidy without regular call to the broader brew cask cleanup command.

Example use case

Here is an example from vanilla Homebrew:

$ brew upgrade --cleanup
==> Upgrading 1 outdated package, with result:
node 6.3.0
==> Upgrading node
==> Downloading https://homebrew.bintray.com/bottles/node-6.3.0.el_capitan.bottle.tar.gz
Already downloaded: /Users/kdeldycke/Library/Caches/Homebrew/node-6.3.0.el_capitan.bottle.tar.gz
==> Pouring node-6.3.0.el_capitan.bottle.tar.gz
==> Caveats
Please note by default only English locale support is provided. If you need
full locale support you should either rebuild with full icu:
  `brew reinstall node --with-full-icu`
or add full icu data at runtime following:
  https://github.com/nodejs/node/wiki/Intl#using-and-customizing-the-small-icu-build

Bash completion has been installed to:
  /usr/local/etc/bash_completion.d
==> Summary
🍺  /usr/local/Cellar/node/6.3.0: 3,829 files, 39.8M
Removing: /usr/local/Cellar/node/6.2.2... (3,771 files, 38.7M)

[daylightbrightledlight]

Has this been successfully integrated?

[vitorgalvao]

Not problematic enough and not enough interest in implementing this, so closing as part of issues cleanup.