pythonPackages: pelican upgrade to 3.6.0 and added ghp-import package

- added ghc-import, smartypants and typogrify packages. last 2 needed as
  a dependency for pelican buildInputs
- updated pelican to 3.6.0 and enable tests
- added myself (garbas) as maintainer to bunch of packages which I use.
- removed usage if python.isPypy and replace it with isPyPy