Remove definition of shouldParse (it's in hspec-attoparsec), and dependency on hspec-expectations.
Define ~> as a specialisation of the version in Hspec.Attoparsec.Source.
Remove main from ParserSpec; we've only one spec, so this is redundant with Spec.main.
Merge pull request #1 from fmapfmapfmap/simplify-tests

Use Test.Hspec.Attoparsec.