Extend Selector remove item API

[Issue] Samsung/TAU-Design-Editor#279
[Problem] Selector item removal API that allows for removing
          items by HTMLElements would be helpful.
[Solution] Extend API to accept both index and HTMLElement

Signed-off-by: Pawel Kaczmarczyk <p.kaczmarczy@samsung.com>

src/js/profile/wearable/widget/wearable/Selector.js

@@ -1809,18 +1809,26 @@
 			/**
 			 * Remove item on specific layer
 			 * @method removeItem
-			 * @param {number} index
+			 * @param {number | HTMLElement} arg1 index of element to remove or HTML element to remove
 			 * @public
 			 * @member ns.widget.wearable.Selector
 			 */
-			prototype.removeItem = function (index) {
+			prototype.removeItem = function (arg1) {
 				var self = this,
 					ui = self._ui,
 					element = self.element,
 					length,
-					itemsOnLayer = self.options.maxItemNumber;
+					itemsOnLayer = self.options.maxItemNumber,
+					index;
 
 				removeLayers(self.element, self.options);
+
+				if (arg1 instanceof HTMLElement) {
+					index = ui.items.indexOf(arg1);
+				} else {
+					index = arg1;
+				}
+
 				element.removeChild(ui.items[index]);
 				ui.items = element.querySelectorAll(self.options.itemSelector);
 				length = ui.items.length;