docker is now a namespace package

Author: shin-

setup.py

@@ -22,7 +22,8 @@
     name="docker-py",
     version=version,
     description="Python client for Docker.",
-    packages=['docker', 'docker.auth', 'docker.unixconn', 'docker.utils'],
+    namespace_packages=['docker'],
+    packages=['docker.auth', 'docker.unixconn', 'docker.utils'],
     install_requires=requirements + test_requirements,
     zip_safe=False,
     test_suite='tests',