Removed serializer properties from proxy and daemon, they're now looked up when needed. Type replacement registrations are now done on all available serializers. Both are in preparation of multi-serializer support.
 SERIALIZERS_ACCEPTED config item added. Daemon checks set of allowed serializers. Fixes issue #17
unittests fixed for multi-serializer config.
fix examples for multi-ser.
docs about new multi ser
updated benchmark numbers in doc