Update README.md.

Just a small rewrite, not really worth a commit, but…
Remove README.md.

Maybe it returns later, but what sense does a readme have if there isn't even any functionality?
Update setup.py.

- Use relative import to import Vipytis's globals

You never know in which context a setup.py is executed.
If the module __name__ in setup.py is not "__main__", the import will fail if it's absolute.
Relative imports make more sense here imho.
Docstring update.

Rewrite docstrings of:
- vipytis.globals
- setup
- vipytis.math.