add antialiaseing pil thumbs

vispa/remote/filesystem.py

@@ -394,7 +394,7 @@ class FileSystem(object):
         if HAVE_PIL:
             output = StringIO()
             img = Image.open(path)
-            img.thumbnail((width, height))
+            img.thumbnail((width, height), Image.ANTIALIAS)
             if sharpen:
                 img.filter(ImageFilter.SHARPEN)
             img.save(output, "JPEG")