pip-installable package

[alanjds]

Changes the folders structure separating the Tools and the Runtime+Stdlib. Allows to test and publish both parts separately. The Tools are tested via pytest, not the Makefile.

The Tools are to be published as grumpy-tools package and Runtime as grumpy-runtime package.

TODO:

• [X] Publish-able on Python Package Index (PyPI)
• [x] Update the README
• [x] Better way to bump the version then editing files. (Maybe via bumpversion?)
• [x] ~Fix a find: 'compiler': No such file or directory Makefile warning~

[alanjds]

I gave up on find: 'compiler': No such file or directory. Too little make skills here; too advanced Makefile there.

Contributions on this front are appreciated ;)

I do consider this PR merge-able.