added OnError api for websocket client
added OnError api for websocket client

kerryjiang/SuperWebSocket,v-rawang/SuperWebSocket,jmptrader/SuperWebSocket,wangzheng888520/SuperWebSocket,v-rawang/SuperWebSocket,zhangwei900808/SuperWebSocket,wangzheng888520/SuperWebSocket,jmptrader/SuperWebSocket,jogibear9988/SuperWebSocket,jogibear9988/SuperWebSocket,v-rawang/SuperWebSocket,kerryjiang/SuperWebSocket,zhangwei900808/SuperWebSocket,v-rawang/SuperWebSocket