add fallback for old safari download and place it after save link block

Author: archmoj

src/snapshot/filesaver.js

@@ -49,6 +49,13 @@ function fileSaver(url, name, format) {
             return resolve(name);
         }
 
+        // Older versions of Safari did not allow downloading of blob urls
+        if(Lib.isSafari()) {
+            var prefix = format === 'svg' ? ',' : ';base64,';
+            helpers.octetStream(prefix + encodeURIComponent(url));
+            return resolve(name);
+        }
+
         reject(new Error('download error'));
     });