⚡ allow providing the loadingoverlay as component to avoid complete rerenders with every load

Author: leoek

packages/react-bootstrap-table2/src/bootstrap-table.js

@@ -34,8 +34,13 @@ class BootstrapTable extends PropsBaseResolver(Component) {
   }
 
   render() {
-    const { loading, overlay } = this.props;
-    if (overlay) {
+    const { loading, overlay, overlayComponent } = this.props;
+    if (overlayComponent){
+      const LoadingOverlay = overlayComponent;
+      <LoadingOverlay active={loading}>
+          { this.renderTable() }
+        </LoadingOverlay>
+    } else if (overlay) {
       const LoadingOverlay = overlay(loading);
       return (
         <LoadingOverlay>