Add example of installing packages with options

I found myself needing this often enough to think others might find the example useful when first reading the readme page, instead of needing to hunt through the issues to find out how to do this:

https://github.com/boxen/puppet-homebrew/issues/9
Merge pull request #35 from mrchrisadams/patch-1

Add example of installing packages with options
Hook instead of monkeypatching bottles.

Make use of the new Homebrew bottle hooks module added in
https://github.com/Homebrew/homebrew/pull/27890 to make the Boxen
bottle handling more robust. Long-term we/you should really move to
using proper Homebrew bottles (with checksums and SSL) but this should
at least stop things getting broken periodically.

I'm aware this may be somewhat controversial so I'm open to other
approaches.