Add the examples and the tests in the installed packages. This way, w…

…e don't need to keep the source directory to run all the tests and examples. This is small.

setup.py

@@ -595,6 +595,9 @@ def main():
     packages = setuptools.find_packages(
         include=["transformer_engine", "transformer_engine.*"],
     )
+    packages += setuptools.find_namespace_packages(
+        include=['examples', 'examples.*', 'tests', 'tests.*']
+    )
 
     # Dependencies
     setup_requires, install_requires, test_requires = setup_requirements()