S.Docs: added instance ToSample ()
refactored Servant.Docs.ToSample
cabal: remove -Werror to allow deprecation warnings
implemented 'instance HasClient Raw'
Client Raw: returns `Right (status, body)` even for failure statuses
html's verbatim is called pre
removed Servant.Docs.printMarkdown
Merge pull request #36 from alpmestan/some_refactorings

Client instance for Raw, API documentation serving, some refactoring.