Add MonadIO instance for RWST
Merge pull request #247 from DanielG/dev-rwst-io

Add MonadIO instance for RWST
fixing fails in travis.
fixing comment.
HasDynFlags is provided after 7.6.
Add support for getting pkgDeps with Cabal <= 1.16
Fix ghc-7.8
Fall back to Cabal 1.16 format on runtime if extracting fails
Import HscTypes (HscEnv) with ghc <= 7.2
Merge pull request #248 from DanielG/dev-cabal-deps

Add support for getting pkgDeps with Cabal <= 1.16
enabling -fno-warn- (#246).
Fix reading of older Cabal `setup-config`s
Make getSystemLibDir use `GHC.Paths` instead of running `ghc`
Fix tests for Cabal <= 1.16
Print useful information when running spec
Fix warnings
Fix Cabal >= 1.18
Merge pull request #249 from DanielG/dev-cabal1.16

Fix reading setup-config with Cabal <= 1.16
Copy ComponentLocalBuildInfo from Cabal-1.18

This way `configDependencies` works even when the Cabal version used by
cabal-install is later than the one used by ghc-mod.
Merge pull request #250 from DanielG/dev-cabal1.16

Copy ComponentLocalBuildInfo from Cabal-1.18