Upgrade to protostuff 1.0.4 and switch again to off-heap buffer

Upgrade to protostuff 1.0.4 and switch again to the new protostuffserializer implementation - which was slower than the old one in 1.0.0

David Ly on google groups said:
> Back when you started testing protostuff (pre 1.0.0), the byte arrays were treated as scalar fields. Sometime february I made a small change that (accidentally) changed the behavior w/c treated the byte arrays like regular arrays (w/c need extra metadata on serialization). 1.0.4 reverts the behavior, plus (re)optimizing collections like List<byte[]>,Map<byte[],byte[]> as well.
The impact is greatly visible in your pert tests.