Merge v1.0.x into master

.travis.yml

PYTHON-MANIFEST.in

Rakefile

doc/.gitignore

etc/roots.pem

examples/cpp/helloworld/Makefile

examples/cpp/route_guide/Makefile

examples/objective-c/auth_sample/AuthTestService.podspec

examples/objective-c/helloworld/HelloWorld.podspec

examples/objective-c/route_guide/RouteGuide.podspec

examples/python/helloworld/greeter_client.py

examples/python/helloworld/greeter_server.py

examples/python/helloworld/helloworld_pb2.py

examples/python/helloworld/run_codegen.py

examples/python/multiplex/.gitignore

examples/python/multiplex/README.md

examples/python/multiplex/helloworld_pb2.py

examples/python/multiplex/multiplex_client.py

examples/python/multiplex/multiplex_server.py

examples/python/multiplex/route_guide_db.json