Merge github.com:grpc/grpc into truebin

BUILD

CMakeLists.txt

Makefile

binding.gyp

build.yaml

cmake/msvc_static_runtime.cmake

config.m4

doc/PROTOCOL-WEB.md

etc/roots.pem

gRPC-Core.podspec

grpc.gemspec

include/grpc++/impl/codegen/call.h

include/grpc++/impl/codegen/status.h

include/grpc/impl/codegen/atm_windows.h

include/grpc/impl/codegen/grpc_types.h

include/grpc/impl/codegen/port_platform.h

package.json

package.xml

src/core/ext/census/grpc_plugin.c

src/core/ext/filters/client_channel/client_channel.c