Add version 3.3.1.

Change-Id: I04c0b6932e87622c16a9496121adb39c750f6464
Reviewed-on: https://git-ccr-1.devtools.intel.com/gerrit/51782
Tested-by: webrtctest <webrtctest@intel.com>
Reviewed-by: Qiu, Jianlin <jianlin.qiu@intel.com>

Author: jianjunz

peerserver.js

@@ -96,6 +96,7 @@ function authorization(socket, next){
     case '3.2':
     case '3.2.1':
     case '3.3':
+    case '3.3.1':
       // socket.user stores session related information.
       if(token){
         validateUser(token, function(uid){  // Validate user's token successfully.