Added fix for spaces in node names

src/main/java/fucoin/configurations/internal/NodeHelper.java

@@ -11,6 +11,8 @@ public class NodeHelper {
             return "Wallet" + n.getId();
         }
 
+        label = label.replace(" ", "_");
+
         if (Character.isDigit(label.charAt(0))) {
             return "Wallet" + label;
         }