Add mockup progress bars to uploads.

public/css/default.css

@@ -676,10 +676,24 @@ a#previous_photo:hover, a#next_photo:hover {
 #upload_preview_area {
 	margin: 10px 0;
 }
-#upload_preview_area img {
+#upload_preview_area > div {
+	display: inline-block;
 	margin: 0 5px 0 0;
+	line-height: 0;
+	position: relative;
+}
+#upload_preview_area .progress {
+	position: absolute;
+	bottom: 0;
+	background: rgba(200, 200, 200, 0.5);
+	height: 5px;
+	width: 100%;
+}
+#upload_preview_area .progress > div {
+	background: #2b2;
+	height: 5px;
+	width: 0%;
 }
-
 
 /* Spinner animation
 ----------------------*/