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
FormulaInstaller#install_bottle? is gone; update monkeypatch
re-add support for older homebrews
Merge pull request #37 from boxen/update-boxen-install-monkeypatch

FormulaInstaller#install_bottle? is gone; update monkeypatch
boxen-monkeypatches: fall back to default bottles.

Homebrew provides a bunch of binary packages for things now. When these
have `cellar :any` it means they can be used for installations outside
`/usr/local`.

This commit means that when there isn't a Boxen bottle available it'll
fall back to the Homebrew bottling infrastructure.
Merge pull request #38 from mikemcquaid/use-homebrew-bottles

boxen-monkeypatches: fall back to default bottles.
Tell which bucket is being used to download the package
Avoid adding more function inside Homebrew class

Even if we are prefixing the method it may clash with Homebrew own
method
Merge pull request #35 from mrchrisadams/patch-1

Add example of installing packages with options
Merge remote-tracking branch 'upstream/master'

Conflicts:
	files/boxen-monkeypatches.rb