Small cleanups of setup.py (#102)

* Limit number of imports in setup.py.

* Make setup.py PEP8 compliant.

setup.py

@@ -1,18 +1,16 @@
 from setuptools import setup, find_packages
-from os import system, makedirs, environ
-
-import morituri
+from morituri import __version__ as morituri_version
 
 setup(
     name="whipper",
-    version=morituri.__version__,
+    version=morituri_version,
     description="a secure cd ripper preferring accuracy over speed",
     author=['Thomas Vander Stichele', 'Joe Lametta', 'Samantha Baldwin'],
     maintainer=['Joe Lametta', 'Samantha Baldwin'],
     url='https://github.com/JoeLametta/whipper',
     license='GPL3',
     packages=find_packages(),
-    entry_points = {
+    entry_points={
         'console_scripts': [
             'whipper = morituri.command.main:main'
          ]