drop support for Cabal < 1.4 and fix hs-source-dirs accordingly
drop support for Cabal < 1.4 and fix hs-source-dirs accordingly
Happstack/happstack-server,arybczak/happstack-server,erantapaa/happstack-server,erantapaa/happstack-server,Happstack/happstack-server,arybczak/happstack-server