better save path

shreddit/shredder.py

@@ -98,7 +98,11 @@ class Shredder(object):
         return False
 
     def _save_item(self, item):
-        with open(os.path.join(self._save_directory, "{}.json".format(item.id)), "w") as fh:
+        name = item.subreddit_name_prefixed[2:].lower()
+        path = "{}/{}/{}.json".format(item.author, name, item.id)
+        if not os.path.exists(os.path.join(self._save_directory, os.path.dirname(path))):
+            os.makedirs(os.path.join(self._save_directory, os.path.dirname(path)))
+        with open(os.path.join(self._save_directory, path), "w") as fh:
             # This is a temporary replacement for the old .json_dict property:
             output = {k: item.__dict__[k] for k in item.__dict__ if not k.startswith("_")}
             output["subreddit"] = output["subreddit"].title