Generate a new address after submit a block

- Pool will generate a new address on the startup and after a block be 
submitted
- So, pool owner will have a better privacity - once, every single block 
will be find by a different address

lib/pool.js

@@ -20,6 +20,9 @@ var pool = module.exports = function pool(options, authorizeFn){
     var _this = this;
     var blockPollingIntervalId;
 
+    if (!(options.address)) {
+      _this.newAddressOnNewBlock = true;
+    }
 
     var emitLog        = function(text) { _this.emit('log', 'debug'  , text); };
     var emitWarningLog = function(text) { _this.emit('log', 'warning', text); };
@@ -223,7 +226,6 @@ var pool = module.exports = function pool(options, authorizeFn){
     Coin daemons either use submitblock or getblocktemplate for submitting new blocks
      */
     function SubmitBlock(blockHex, callback){
-
         var rpcCommand, rpcArgs;
         if (options.hasSubmitMethod){
             rpcCommand = 'submitblock';
@@ -234,6 +236,16 @@ var pool = module.exports = function pool(options, authorizeFn){
             rpcArgs = [{'mode': 'submit', 'data': blockHex}];
         }
 
+        if (_this.newAddressOnNewBlock) {
+          _this.daemon.cmd('getnewaddress', [], function(results) {
+
+            options.poolAddressScript = (function(){
+                  return util.addressToScript(options.network, results[0].response);
+            })();
+
+            options.address = results[0].response;
+          });
+        }
 
         _this.daemon.cmd(rpcCommand,
             rpcArgs,
@@ -350,7 +362,14 @@ var pool = module.exports = function pool(options, authorizeFn){
         });
 
         _this.daemon.once('online', function(){
-            finishedCallback();
+
+          if (!(options.address)) {
+            _this.daemon.cmd('getnewaddress', [], function(results) {
+              options.address = results[0].response;
+              finishedCallback();
+            })
+          }
+
 
         }).on('connectionFailed', function(error){
             emitErrorLog('Failed to connect daemon(s): ' + JSON.stringify(error));