no longer install as zipped egg

Actually most installations have been broken since refactoring of
default configurations into a dedicated file. I feel a little bad, but
Python Packaging is broken anyways.

setup.py

@@ -17,7 +17,7 @@ setup(
     author_email='info@posativ.org',
     packages=find_packages(),
     include_package_data=True,
-    zip_safe=True,
+    zip_safe=False,
     url='https://github.com/posativ/isso/',
     license='MIT',
     description='lightweight Disqus alternative',