Install all test files with package

Test factories can be useful in building project tests.

CHANGELOG.md

@@ -1,3 +1,8 @@
+## [unreleased]
+
+### Changed
+- Test factories and other test files are now included in the package installation. Factories can be useful when creating project tests.
+
 ## [0.3.1] - 2016-04-13
 
 ### Added

setup.py

@@ -16,7 +16,7 @@ setup(
     maintainer_email='mail@jasonrobinson.me',
     url='https://github.com/jaywink/social-federation',
     download_url='https://github.com/jaywink/social-federation/releases',
-    packages=find_packages(exclude=["*.tests.*", "*.tests"]),
+    packages=find_packages(),
     license="BSD 3-clause",
     install_requires=[
         "dirty-validators==0.3.2",