Merge pull request #10293 from nicolasnoble/upmerge-1.2.0

BUILD

Rakefile

binding.gyp

gRPC-Core.podspec

gRPC-ProtoRPC.podspec

gRPC-RxLibrary.podspec

gRPC.podspec

package.json

setup.py

src/compiler/csharp_generator.cc

src/core/lib/iomgr/tcp_server_posix.c

src/core/lib/iomgr/timer_uv.c

src/csharp/Grpc.Core/ChannelOptions.cs

src/csharp/Grpc.Examples/MathGrpc.cs

src/csharp/Grpc.HealthCheck/HealthGrpc.cs

src/csharp/Grpc.IntegrationTesting/MetricsGrpc.cs

src/csharp/Grpc.IntegrationTesting/ServicesGrpc.cs

src/csharp/Grpc.IntegrationTesting/TestGrpc.cs

src/csharp/Grpc.Reflection/ReflectionGrpc.cs

src/node/ext/server_uv.cc