Added Attract extension.

For now it just contains a management command, but I ensured it is
registered properly through the Pillar extension system.

setup.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python
+
+"""Setup file for testing, not for packaging/distribution."""
+
+import setuptools
+
+setuptools.setup(
+    name='blender-cloud',
+    version='1.0',
+    packages=setuptools.find_packages('.', exclude=['tests']),
+    tests_require=[
+        'pytest>=2.9.1',
+        'responses>=0.5.1',
+        'pytest-cov>=2.2.1',
+        'mock>=2.0.0',
+    ],
+    zip_safe=False,
+)