add ability to use single socket

.gitignore

@@ -1,3 +1,4 @@
 node_modules
 testing
 .DS_Store
+.idea

lib/sockets/sock.js

@@ -51,6 +51,9 @@ function Socket() {
   this.set('identity', String(process.pid));
   this.set('retry timeout', 100);
   this.set('retry max timeout', 5000);
+
+  //a single socket mode so that if a socket dies without event, a new connection can replace the old socket, to avoid a round robin socket selection on dead sockets
+  this.set('single_socket_mode',false);
 }
 
 /**
@@ -170,6 +173,13 @@ Socket.prototype.removeSocket = function(sock){
  */
 
 Socket.prototype.addSocket = function(sock){
+  if(this.get('single_socket_mode') && this.socks.length > 0) {
+    var xSock = this.socks.pop(); //remove the last socket and replace with the new socket that just connected.
+    if(xSock)
+    xSock.destroy();
+
+  }
+
   var parser = new Parser;
   var i = this.socks.push(sock) - 1;
   debug('%s add socket %d', this.type, i);