add GalleryView component

src/helpers/common.js

@@ -8,3 +8,15 @@ export function toCommaList (arr, key = 'name') {
   if (!arr) return
   return arr.map(item => item[key]).join(', ')
 }
+
+
+export function shuffle (a) {
+  let j, x, i
+  for (i = a.length - 1; i > 0; i--) {
+    j = Math.floor(Math.random() * (i + 1))
+    x = a[i]
+    a[i] = a[j]
+    a[j] = x
+  }
+  return a
+}