add example for req/rep pair PR: #94
add example for req/rep pair
PR: #94

hechunwen/node-nanomsg,nickdesaulniers/node-nanomsg,hechunwen/node-nanomsg,nickdesaulniers/node-nanomsg,nickdesaulniers/node-nanomsg,tempbottle/node-nanomsg,tempbottle/node-nanomsg,hechunwen/node-nanomsg,tempbottle/node-nanomsg,nickdesaulniers/node-nanomsg,tempbottle/node-nanomsg,hechunwen/node-nanomsg