Documenting keg-only outside of Homebrew.

How-to-use-keg-only-outside-of-brew:
* A new piece of documentation detailing how to deal with using
keg_only formula outside of Brew itself. We’ve had a lot of questions
and issues about this recently, and the solutions aren’t as easy and
explicit to find elsewhere, so detailing it here may help reduce some
of the questions we’ve seen recently.
* I possibly whinged too much in the second section. I’m open to
criticism and being called whiny.
* Details flags, prepending the $PATH, and dealing with pkg-config.

temp

temp

Revert "temp"

This reverts commit e65d873488d6f8f77be1034247fb6dc128fdbf3b.

Revert "Documenting keg-only outside of Homebrew."

This reverts commit 5b96dc6152587cd8c5e86c55a5098c7c1dcbf077.