Update setup.py for finding the package correctly

Author: mitechie

setup.py

@@ -10,7 +10,8 @@
     long_description=open("README").read(),
     license="Apache License 2.0",
     url="http://github.com/buriy/python-readability",
-    packages=find_packages(),
+    package_dir={'': 'readability'},
+    packages=find_packages('readability', exclude=["*.tests", "*.tests.*"]),
     install_requires=[
         "chardet",
         "lxml"