Fix bug in release
ignore if libgmp.so has already been linked to correct spot
call heroku-pre-install script in directory before installing (if it exists)

can be used to install c dependencies etc.
Merge pull request #1 from timjb/master

Add `heroku-pre-install` hook
trying to work out why criterion is being pulled in.
Merge remote-tracking branch 'origin/patch-1'

Conflicts:
	bin/compile
Merge branch 'master' of github.com:mwotton/heroku-buildpack-haskell

Conflicts:
	bin/compile
	bin/release
use threaded runtime for compiles
bad idea, threaded goes in the cabal file
Update compile
Merge remote-tracking branch 'origin/patch-2'

Conflicts:
	bin/compile