Merge remote-tracking branch 'upstream/v1.0.x' into ruby_tools_plugin_arg

package.xml

src/php/ext/grpc/call.c

src/php/ext/grpc/call_credentials.c

src/php/ext/grpc/call_credentials.h

src/php/ext/grpc/channel.c

src/php/ext/grpc/channel_credentials.c

src/php/ext/grpc/channel_credentials.h

src/php/ext/grpc/package.xml

src/php/ext/grpc/php7_wrapper.h

src/php/ext/grpc/server.c

src/php/ext/grpc/server.h

src/php/ext/grpc/server_credentials.c

src/php/ext/grpc/server_credentials.h

src/php/ext/grpc/timeval.c

src/ruby/tools/bin/grpc_tools_ruby_protoc

src/ruby/tools/bin/grpc_tools_ruby_protoc_plugin

src/ruby/tools/grpc-tools.gemspec

templates/package.xml.template