add setup.py. for venv

docs/setup.py

-import os
-from setuptools import setup, find_packages
+from setuptools import setup
 
 setup(
     name='bedtools',
-    version="2.16.2",
-    description='A flexible toolset for genome arithmetic',
-    author='Aaron Quinlan',
-    author_email='arq5x@virginia.edu',
-    url='http://bedtools.googelcode.come',
-    packages=find_packages(),
-    include_package_data=True,
-    zip_safe=False
-)
\ No newline at end of file
+    install_requires=['matplotlib', 'matplotlib.sphinxext'],
+    )