Merge remote-tracking branch 'upstream/master'

Makefile

build.json

include/grpc++/stream.h

include/grpc++/stream_context_interface.h

include/grpc/grpc.h

include/grpc/support/port_platform.h

src/compiler/cpp_generator.cc

src/compiler/go_generator.cc

src/compiler/go_generator.h

src/compiler/go_plugin.cc

src/core/channel/http_client_filter.c

src/core/channel/http_client_filter.h

src/core/security/security_context.c

src/core/support/log_posix.c

src/core/support/log_win32.c

src/core/support/time.c

src/core/surface/call.c

src/cpp/stream/stream_context.cc

src/cpp/stream/stream_context.h

templates/vsprojects/vs2013/build_and_run_tests.bat.template