added outsideclick as custom directive

ref #27

src/components/outsideclick.js

@@ -0,0 +1,10 @@
+/** Dispatch event on click outside of node */
+export function clickOutside(node) {
+	const handleClick = (event) => {
+		if (event.target.getAttribute('data-id') === 'modal_backdrop') {
+			node.dispatchEvent(new CustomEvent('click_outside', node));
+		}
+	};
+	document.removeEventListener('click', handleClick, true);
+	document.addEventListener('click', handleClick, true);
+}