bump to 2.5.0
bump to 2.5.0

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