Add a formula for GNU ed 1.8

Closes #176.

Signed-off-by: Misty De Meo <mistydemeo@gmail.com>
zlib 1.2.8

* Drop patch. Upstream already handles Apple correctly.

Closes: https://github.com/Homebrew/homebrew-dupes/issues/180.

Closes #181.

Signed-off-by: Misty De Meo <mistydemeo@gmail.com>