Show cabal stderr when error messages could not be parsed.
Show cabal stderr when error messages could not be parsed.

This is required e.g. when cabal wants us to "run cabal configure first".

kgadek/SublimeHaskell,Bodigrim/SublimeHaskell,kgadek/SublimeHaskell,SublimeHaskell/SublimeHaskell,tomv564/SublimeHaskell,bscottm/SublimeHaskell,bscottm/SublimeHaskell,hcarvalhoalves/SublimeHaskell,SublimeHaskell/SublimeHaskell,Bodigrim/SublimeHaskell,tomv564/SublimeHaskell,hcarvalhoalves/SublimeHaskell