Merge github.com:grpc/grpc into test_affine

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

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

src/core/lib/channel/compress_filter.c

src/core/lib/channel/compress_filter.h

src/core/lib/iomgr/exec_ctx.c

src/core/lib/iomgr/exec_ctx.h

src/core/lib/support/string_util_win32.c

src/core/lib/surface/byte_buffer_reader.c

src/core/lib/surface/call.c

src/core/lib/surface/init.c

src/php/ext/grpc/call.c

src/php/ext/grpc/call.h

src/php/ext/grpc/call_credentials.c

src/php/ext/grpc/channel.c

src/php/ext/grpc/channel.h

src/php/ext/grpc/channel_credentials.c

src/php/ext/grpc/server.c

src/php/ext/grpc/server_credentials.c

src/php/ext/grpc/timeval.c

src/php/ext/grpc/timeval.h