Proto commits in badoo/pinba2

These 2 commits are when the Protocol Buffers files have changed:

Commit:0ee358e
Author:Anton Povarov

protofile: changed string fields to bytes, to save on strlen() calls. 'string' and 'bytes' are compatible on the wire, so it should be a non-issue from correctness standpoint

The documentation is generated from this commit.

Commit:45a642d
Author:Anton Povarov

initial, experiment in progress