Improved loading indicators. Added % loaded to viewports and thumbnails

Packages/viewerbase/components/studyBrowser/thumbnails/thumbnails.js

@@ -1,6 +1,15 @@
 Template.thumbnails.helpers({
-  thumbnails: function() {
-    var stacks = createStacks(this);
-    return stacks;
-  }
+    thumbnails: function() {
+        var stacks = createStacks(this.study);
+        var studyIndex = this.studyIndex;
+        
+        var array = [];
+        stacks.forEach(function(stack, index) {
+            array.push({
+                thumbnailIndex: index * (studyIndex + 1),
+                stack: stack
+            });
+        });
+        return array;
+    }
 });