Migrate default install script from ruby to bash

[bbros-dev]

Closes issue #135.

Ruby Homebrew installer is now deprecated and should be migrated to Bash.

Description

Install now works when using default values:

include_recipe 'homebrew'

Issues Resolved

Closes issue #135

Check List

• [x] All tests pass. See https://github.com/chef-cookbooks/community_cookbook_documentation/blob/master/TESTING.MD
• [x] New functionality includes testing.
• [x] New functionality has been documented in the README if applicable
• [x] Obvious Fix All commits have been signed for the Developer Certificate of Origin. See https://github.com/chef-cookbooks/community_cookbook_documentation/blob/master/CONTRIBUTING.MD

[tas50]

Thanks @bbros-dev

[ehanlon]

Fixes #135