added missing header & fixed initializer warnings
added missing header & fixed initializer warnings

zeromq/zmqpp,chenwenbin928/zmqpp,datasift/zmqpp,benjamg/zmqpp,kernelim/zmqpp,sunkin351/zmqpp,kernelim/zmqpp,datasift/zmqpp,pin3da/zmqpp,pin3da/zmqpp,benjamg/zmqpp,xaqq/zmqpp,zeromq/zmqpp,sunkin351/zmqpp,xaqq/zmqpp,chenwenbin928/zmqpp