Update renderer FormInstance data on every change

And expose functions to get data and schema from the instance.

Author: bhch

src/renderer.js

@@ -28,6 +28,8 @@ export function FormInstance(config) {
     };
 
     this.onChange = function(e) {
+        this.data = e.data;
+
         if (!this.eventListeners)
             return;
 
@@ -68,6 +70,14 @@ export function FormInstance(config) {
 
         this.render();
     };
+
+    this.getSchema = function() {
+        return this.schema;
+    };
+
+    this.getData = function() {
+        return this.data;
+    };
 }