I was going to start making these changes and I noticed that it doesn't currently build with ghc 7.4.1 w/Haskell Platform:

https://travis-ci.org/dagit/lambdabot/builds/5541375

Do you know if the constraints on:

regex-posix-0.95.1

regex-compat-0.95.1

Need to be what they are? Could we relax them without breaking anything?