setup.py: exclude all test files

by using exclude feature of find_packages.
Plus remove now obselete package_data setting

Signed-off-by: Konrad Weihmann <kweihmann@outlook.com>

Author: priv-kweihmann

setup.py

@@ -74,9 +74,9 @@ def _stamp_version(filename):
     author="Sebastian Thiel, Michael Trier",
     author_email="byronimo@gmail.com, mtrier@gmail.com",
     url="https://github.com/gitpython-developers/GitPython",
-    packages=find_packages('.'),
+    packages=find_packages(exclude=("test.*")),
+    include_package_data=True,
     py_modules=['git.' + f[:-3] for f in os.listdir('./git') if f.endswith('.py')],
-    package_data={'git.test': ['fixtures/*']},
     package_dir={'git': 'git'},
     python_requires='>=3.4',
     install_requires=requirements,