[foolfuuka] add support for more sites (#18)

- https://arch.b4k.co
- https://archive.whatisthisimnotgoodwithcomputers.com
- https://archive.yeet.net

Notes:
- The name "whatisthisimnotgoodwithcomputers" is way too long ...
- archive.yeet.net is out of date and also blocked by 4chan servers
  - newest threads are 2 weeks old
  - using "https://archive.yeet.net" as Referer header results in
    "403 Forbidden" when accessing 4chan

gallery_dl/extractor/whatisthisimnotgoodwithcomputers.py

@@ -0,0 +1,23 @@
+# -*- coding: utf-8 -*-
+
+# Copyright 2017 Mike Fährmann
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+
+"""Extract images from https://archive.whatisthisimnotgoodwithcomputers.com"""
+
+from . import chan
+
+
+class WitingwcThreadExtractor(chan.FoolfuukaThreadExtractor):
+    """Extractor for archive.whatisthisimnotgoodwithcomputers.com"""
+    category = "whatisthisimnotgoodwithcomputers"
+    root = "https://archive.whatisthisimnotgoodwithcomputers.com"
+    pattern = [r"(?:https?://)?archive\.whatisthisimnotgoodwithcomputers\.com/"
+               r"([^/]+)/thread/(\d+)"]
+    test = [(("https://archive.whatisthisimnotgoodwithcomputers.com/"
+              "ref/thread/1094/"), {
+        "url": "cf8f6d4b4950767d2131de308ebc96eec05b04f6",
+    })]