use setuptools instead distutils to support install_requires.

Author: rmax

setup.cfg

@@ -0,0 +1,8 @@
+[aliases]
+test = nosetests
+
+[nosetests]
+#with-coverage = 1
+cover-html = 1
+cover-html-dir = coverage-html
+cover-package = scrapy_redis

setup.py

@@ -1,5 +1,5 @@
 import os
-from distutils.core import setup
+from setuptools import setup
 
 
 LONG_DESC = open(os.path.join(os.path.dirname(__file__), 'README.rst')).read()