Merge branch 'master' of https://github.com/grpc/grpc-common into testy-master

PROTOCOL-HTTP2.md

README.md

cpp/helloworld/Makefile

cpp/helloworld/greeter_client.cc

cpp/helloworld/greeter_server.cc

cpp/helloworld/helloworld.pb.cc

cpp/helloworld/helloworld.pb.h

java/run_greeter_client.sh

java/run_greeter_server.sh

java/src/main/java/ex/grpc/GreeterClient.java

java/src/main/java/ex/grpc/GreeterGrpc.java

java/src/main/java/ex/grpc/GreeterImpl.java

java/src/main/java/ex/grpc/GreeterServer.java

java/src/main/java/ex/grpc/Helloworld.java

java/src/main/proto/helloworld.proto

node/.gitignore

node/README.md

node/greeter_client.js

node/greeter_server.js

node/helloworld.proto