bos/attoparsec — pull request #46 by whittle (2013-06-01 23:32:42+00:00)
Title: Add the optionMaybe combinator

I found myself needing this combinator in multiple locations, so I added it to attoparsec.

Originally I named it mOption, but when I realized that parsec provided an identical combinator called optionMaybe, I renamed it to match parsec.