Use twine to release to PyPI

[andy-maier]

I learned that the twine package has two advantages over setup.py upload:

• It uses encrypted communication with PyPI (setup.py added that too at some point, but I think not for Pyhton 2.6).
• It creates metadata on PyPI for the package dependencies. This results in a human readable section on the PyPI page, and I believe it also improves the machine-readable metadata about the dependencies.

[nir0s]

I actually started using twine just recently. It's really nice. I'm all for it.

[andy-maier]

I recently switched to twine in another project, and can contribute a PR to distro, soon.

[nir0s]

FYI, I already released a wheel using twine.. just didn't change the Makefile to do that. You're invited :)