Add a combined command for the archiver and downloader: clone (#433)

* Simplify downloader function

* Add basic scraper class

* Add "scrape" command

* Rename "scrape" command to "clone"

* Add integration tests for clone command

* Update README

* Fix failing test

bdfr/cloner.py

@@ -0,0 +1,21 @@
+#!/usr/bin/env python3
+# coding=utf-8
+
+import logging
+
+from bdfr.archiver import Archiver
+from bdfr.configuration import Configuration
+from bdfr.downloader import RedditDownloader
+
+logger = logging.getLogger(__name__)
+
+
+class RedditCloner(RedditDownloader, Archiver):
+    def __init__(self, args: Configuration):
+        super(RedditCloner, self).__init__(args)
+
+    def download(self):
+        for generator in self.reddit_lists:
+            for submission in generator:
+                self._download_submission(submission)
+                self.write_entry(submission)