Fix for #34
Fix for #34

As of right now, the steerable proxy functionality requires version 4.1.0.
virtdb/cppzmq,cmcmurrough/cppzmq,bsn069/cppzmq,jens-auer/cppzmq,caidongyun/cppzmq,K0n63n/cppzmq,eburkitt/cppzmq,zeromq/cppzmq,michele-brambilla/ConfigurationService,michele-brambilla/ConfigurationService,michele-brambilla/ConfigurationService,michele-brambilla/ConfigurationService,michele-brambilla/ConfigurationService,zeromq/cppzmq,chenwenbin928/cppzmq