Welly 0.0.1

[apt...@googlemail.com]

Welly version 0.0.1 is now available to download:

    https://wellylang.org/releases/welly-0.0.1.tgz

It now uses Python 3, as Python 2 is no longer supported.

This only updates the Welly-in-Python demo, which remains the most presentable version of Welly. We have been doing lots of work behind the scenes, prototyping features. Most notably, Mijit implements native code generation.