Give a fresh 🍺 after hard work of brew install

- Name of the brewed formula in "Summary" heading.
- At the beginning of the summary line a 🍺  is given out
  (but only on Lion or above). This acts as a nice
  visual marker for the end of a brew-ing process.
- When brewing a dependency, the name is highlighted in green.
- `oh1` is bold, too (like ohai).

Closes #16020.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>