Fix the find_packages() usage.

setup.py

@@ -24,7 +24,7 @@
 
 
 import os.path
-from setuptools import setup
+from setuptools import setup, find_packages
 
 
 here = os.path.abspath(os.path.dirname(__file__))
@@ -136,7 +136,7 @@ setup(
     tests_require = ['Tailbone[tests]'],
     test_suite = 'nose.collector',
 
-    packages = ['tailbone'],
+    packages = find_packages(exclude=['tests.*', 'tests']),
     include_package_data = True,
     zip_safe = False,