Missing returns for Node.{insertBefore, appendChild, replaceChild, removeChild} (#15)

* insertBefore should return childNode that was inserted, to match dom api.

* correcting whitespace

* missing returns for appendChild, replaceChild, removeChild

Author: andyrj

src/undom.js

@@ -51,21 +51,24 @@ export default function undom() {
 		}
 		appendChild(child) {
 			this.insertBefore(child);
+			return child;
 		}
 		insertBefore(child, ref) {
 			child.remove();
 			child.parentNode = this;
-			if (!ref) this.childNodes.push(child);
-			else splice(this.childNodes, ref, child);
+			!ref ? this.childNodes.push(child) : splice(this.childNodes, ref, child);
+			return child;
 		}
 		replaceChild(child, ref) {
 			if (ref.parentNode===this) {
 				this.insertBefore(child, ref);
 				ref.remove();
+				return ref;
 			}
 		}
 		removeChild(child) {
 			splice(this.childNodes, child);
+			return child;
 		}
 		remove() {
 			if (this.parentNode) this.parentNode.removeChild(this);