Merge github.com:grpc/grpc into delayed-write

.gitmodules

.travis.yml

BUILD

CMakeLists.txt

Makefile

PYTHON-MANIFEST.in

build.yaml

composer.json

examples/cpp/helloworld/Makefile

examples/cpp/route_guide/Makefile

examples/objective-c/auth_sample/Podfile

examples/objective-c/helloworld/Podfile

examples/objective-c/route_guide/Podfile

examples/php/README.md

examples/php/composer.json

examples/python/helloworld/run_codegen.sh

examples/python/route_guide/run_codegen.sh

gRPC-Core.podspec

gRPC-ProtoRPC.podspec

gRPC-RxLibrary.podspec