Move to epocxy 0.9.8 to sync with ttserver/uffda

While moving ttserver to 0.9.8 so that it could incorporate Uffda, I discovered that kafkerl needs to change at the same time for compatibility. This merge has to be coordinated, or should be made with a new version tag.
Merge pull request #10 from jaynel/patch-1

Move to epocxy 0.9.8 to sync with ttserver/uffda