Changes for upload as PyPI package.

README.rst was created using:
   pandoc --from=markdown --to=rst README.md -o README.rst

Steps to register and upload:
   python setup.py register # only once
   python setup.py sdist    # create dist/uptide-XXX.tar.gz first
       # so we can check contents before uploading
   python setup.py sdist upload # do it again and upload
   git tag uptide-XXX # of course, make sure everything is committed first