Fix installation problems.

via python-list.

> Tons of things are wrong.

> * SyntaxError: Non-ASCII character '\xc5' in file `lsystem/__init__.py` on line 6, but no encoding declared; see http://python.org/dev/peps/pep-0263/ for details
* you should not import your package in setup.py ← **NOT FIXED**
* you are python 3-only for no real reason at all
* the zip on PyPI is for version 0.1.3.  It ignores the version 0.1-5, because of the dash, which should not be used in names of stable software
* and, most importantly, you’re doing things using ancient methods.  Upgrade your setup.py to use setuptools, and its entry points mechanism.