better history handling

lib/collection.js

@@ -302,9 +302,9 @@ Collection.prototype.canNodeUpdate = function(id)
 
 	if(node.canUpdate())
 	{
-		var diff = this._blockchain.bestBlockNumber() - node.getBlockNumber();
+		var diff = node.getBlockNumber() - this._blockchain.bestBlockNumber();
 
-		return (diff <= 0);
+		return Boolean(diff >= 0);
 	}
 
 	return false;

lib/history.js

@@ -634,7 +634,8 @@ History.prototype.getCharts = function()
 
 History.prototype.requiresUpdate = function()
 {
-	return ( this._items.length < MAX_HISTORY && !_.isEmpty(this._items) );
+	// return ( this._items.length < MAX_HISTORY && !_.isEmpty(this._items) );
+	return ( this._items.length < MAX_HISTORY );
 }
 
 History.prototype.getHistoryRequestRange = function()