Use setuptools to install python files

Now, to reference mininet files, use 'import mininet.mininet'.

PYTHONPATH mods are no longer required for installation.

setup.py

@@ -0,0 +1,27 @@
+#!/usr/bin/env python
+'''Setuptools params'''
+
+from setuptools import setup, find_packages
+
+setup(
+    name='mininet',
+    version='0.0.0',
+    description='The OpenFlow-based data center network',
+    author='Bob Lantz',
+    author_email='rlantz@cs.stanford.edu',
+    packages=find_packages(exclude='test'),
+    long_description="""\
+Insert longer description here.
+      """,
+      classifiers=[
+          "License :: OSI Approved :: GNU General Public License (GPL)",
+          "Programming Language :: Python",
+          "Development Status :: 4 - Beta",
+          "Intended Audience :: Developers",
+          "Topic :: Internet",
+      ],
+      keywords='networking protocol Internet OpenFlow',
+      license='GPL',
+      install_requires=[
+        'setuptools'
+      ])