Merge remote-tracking branch 'upstream/master'

src/compiler/ruby_generator.cc

src/compiler/ruby_generator.h

src/compiler/ruby_generator_helpers-inl.h

src/compiler/ruby_generator_map-inl.h

src/compiler/ruby_generator_string-inl.h

src/compiler/ruby_plugin.cc

src/php/ext/grpc/call.c

src/php/ext/grpc/call.h

src/php/ext/grpc/channel.c

src/php/ext/grpc/completion_queue.c

src/php/ext/grpc/completion_queue.h

src/php/ext/grpc/config.m4

src/php/ext/grpc/event.c

src/php/ext/grpc/event.h

src/php/ext/grpc/php_grpc.c

src/php/ext/grpc/server.c

src/php/ext/grpc/server.h

src/php/lib/Grpc/ActiveCall.php

src/php/tests/unit_tests/CallTest.php

src/php/tests/unit_tests/CompletionQueueTest.php