bump to 2.2.2
bump to 2.2.2

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