bump to 2.5.2
bump to 2.5.2

film42/protobuf,ruby-protobuf/protobuf,quixoten/protobuf,lookout/protobuffy,film42/protobuf,lookout/protobuffy,localshred/protobuf,localshred/protobuf,quixoten/protobuf,zanker/protobuf,brianstien/protobuf,ruby-protobuf/protobuf,zanker/protobuf,brianstien/protobuf