fix(virtual-repeat): use parentNode instead of parentElement on the i…

…njected element

Template anchors are converted to comment anchors. Thus is the injected element a comment node which does not have parentElement in IE, instead parentNode should be used.

Fixes #4

src/virtual-repeat.js

@@ -28,7 +28,7 @@ export class VirtualRepeat {
 
   bind(executionContext){
     this.executionContext = executionContext;
-    this.virtualScrollInner = this.element.parentElement;
+    this.virtualScrollInner = this.element.parentNode;
     this.virtualScroll = this.virtualScrollInner.parentElement;
     this.createScrollIndicator();
     this.virtualScroll.style.overflow = 'hidden';