Merge pull request #1755 from hmhealey/plt1108

PLT-1108 Refactored ViewImage modal and made it automatically play animated gifs

web/sass-files/sass/partials/_files.scss

@@ -257,3 +257,8 @@
         @include opacity(0);
     }
 }
+
+.view-image__loading {
+    background: black;
+    min-height: 100px;
+}