add sharpening to pil thumbnails

vispa/remote/filesystem.py

@@ -396,7 +396,7 @@ class FileSystem(object):
             img = Image.open(path)
             img.thumbnail((width, height))
             if sharpen:
-                im.filter(ImageFilter.SHARPEN)
+                img.filter(ImageFilter.SHARPEN)
             img.save(output, "JPEG")
             contents = output.getvalue()
             output.close()