authenticate-oauth: Fix missing #endif.
authenticate-oauth: Use conduit == 1.1.*.
authenticate-oauth: Major version bump due to API change.
authenticate-oauth: Drop support for conduit < 2.0.
authenticate-oauth: Drop support for RSA < 2.0.
authenticate-oauth: Remove lots of unused imports (compiles cleanly now).
authenticate-oauth: Use MonadIO instead of MonadBase IO.
authenticate-oauth: Use http-client instead of http-conduit.