Refactor error message for argument mismatch to be more generic

Previously an insufficient amount of arguments to e.g. the 'type' utility resulted in a "Too many arguments" feedback, which can be somewhat confusing. Now if the argument count does not match, a more generic error message is shown.
Revert "Fix tests for Cabal <= 1.16"

The problem the reverted commit tried to fix seems to have been just a
symptom of another root cause that was later fixed as the problem does
not seem to occur anymore even without this changeset also this
changeset broke cabal sandboxes with ghc < 7.8.

Fix #262

This reverts commit 8741323f5b9c5450c40205d0632f61a4b7e42125.

Conflicts:
	Language/Haskell/GhcMod/GhcPkg.hs
Add test for sandbox compatibility with ghc < 7.8
Merge pull request #263 from DanielG/dev-fix-262

Revert "Fix tests for Cabal <= 1.16"
Merge pull request #261 from saminiir/master

Refactor error message for argument mismatch to be more generic
readme.
readme.
readme.