Merge remote-tracking branch 'upstream/master' into shut_down_acceptor_early

.travis.yml

BUILD

CMakeLists.txt

Makefile

build.yaml

composer.json

doc/c-style-guide.md

doc/statuscodes.md

examples/csharp/helloworld/README.md

examples/objective-c/auth_sample/AuthTestService.podspec

examples/objective-c/auth_sample/Podfile

examples/objective-c/helloworld/HelloWorld.podspec

examples/objective-c/helloworld/Podfile

examples/objective-c/route_guide/Podfile

examples/objective-c/route_guide/RouteGuide.podspec

examples/php/README.md

examples/php/composer.json

include/grpc++/server.h

include/grpc++/support/slice.h

package.json