Include all package data in the binary distribution

Using MANIFEST.in would include those files in the source distribution,
but include_package_data is need to also include all of them in the
binary distribution.
The binary distrution was missing tests on others not included in
package_data.

setup.py

@@ -58,6 +58,7 @@ setup(
         'Development Status :: 4 - Beta',
     ],
     packages=find_packages(),
+    include_package_data=True,
     package_data={
         'sbws': get_package_data(),
     },