Perfunctory gofmt -w -s=true.
Simplify Protobuf Encoding by Removing Buffers

This commit removes the explicit Protocol Buffer coding buffer, for
goprotobuf's proto.{Marshal,Unmarshal} automatically allocate an
empty buffer, just like the original code did.
Merge pull request #90 from matttproud/refactor/coding/simplification

Simplify Protobuf Encoding by Removing Extraneous Buffers