Add info property to groups

Author: knolleary

lib/NRGroup.js

@@ -22,9 +22,12 @@ class NRGroup extends NRContainer {
         delete config.g;
 
         this.style = config.style;
+        this.info = config.info;
+
         delete config.w;
         delete config.h;
         delete config.style;
+        delete config.info;
         this._nodes = config.nodes;
         delete config.nodes;
     }
@@ -50,6 +53,9 @@ class NRGroup extends NRContainer {
         if (this.style) {
             obj.style = this.style;
         }
+        if (this.info !== undefined) {
+            obj.info = this.info;
+        }
         obj.nodes = Array.from(this.nodes.keys())
         return obj;
     }