Merge github.com:grpc/grpc into scalable-poll

.travis.yml

Makefile

build.json

doc/interop-test-descriptions.md

include/grpc/grpc.h

src/compiler/cpp_generator.cc

src/compiler/csharp_generator.cc

src/compiler/objective_c_generator.cc

src/compiler/ruby_generator.cc

src/core/iomgr/pollset_posix.c

src/core/surface/call.h

src/core/surface/call_log_batch.c

src/core/surface/server.c

src/core/surface/server.h

src/core/transport/chttp2/alpn.c

src/core/tsi/ssl_transport_security.c

src/csharp/README.md

src/node/examples/math_server.js

src/node/examples/stock_server.js

src/node/package.json