Add failing test for versioned repositories.

testing/resources/python3_hooks_repo/hooks.yaml

@@ -0,0 +1,5 @@
+-   id: python3-hook
+    name: Python 3 Hook
+    entry: python3-hook
+    language: python
+    language_version: python3.3

testing/resources/python3_hooks_repo/python3_hook/main.py

@@ -0,0 +1,9 @@
+from __future__ import print_function
+import sys
+
+
+def func():
+    print('{0}.{1}'.format(*sys.version_info[:2]))
+    print(repr(sys.argv[1:]))
+    print('Hello World')
+    return 0

testing/resources/python3_hooks_repo/setup.py

@@ -0,0 +1,11 @@
+from setuptools import find_packages
+from setuptools import setup
+
+setup(
+    name='python3_hook',
+    version='0.0.0',
+    packages=find_packages('.'),
+    entry_points={
+        'console_scripts': ['python3-hook = python3_hook.main:func'],
+    },
+)