In the yum module example, use present/absent instead of installed/removed
Fix missing code block in playbook variables doc

A code sample was not being rendered as a code block. This adds the preceding '::' reStructuredText markup.
Merge pull request #7931 from quiver/fix-yum-module-doc

In yum module example, use present/absent instead of installed/removed
Merge pull request #7934 from chrishepner/patch-1

Fix missing code block in playbook variables doc
Additional fixes for safe_eval
Update RELEASES.txt
Update homebrew module to use the new JSON 'info' output.

See: https://github.com/Homebrew/homebrew/wiki/Querying-Brew
Make homebrew module handle 'devel' and sub-minor-revision edge cases.
Account for old versions of homebrew in homebrew module.