Merge pull request #1049 from righettod/rssfeed_add

Add a dict with common RSS feed file names.

Source: https://github.com/adulau/rss-tools/blob/master/bin/rssfind.py#L21

Discovery/Web-Content/rssfeed-files.txt

@@ -0,0 +1,26 @@
+index.xml
+feed.xml
+feed.atom
+feed.rss
+feed.json
+feed.php
+feed.asp
+posts.rss
+blog.xml
+atom.xml
+podcasts.xml
+main.atom
+main.xml
+feed/index.xml
+feed/feed.xml
+feed/feed.atom
+feed/feed.rss
+feed/feed.json
+feed/feed.php
+feed/feed.asp
+feed/posts.rss
+feed/blog.xml
+feed/atom.xml
+feed/podcasts.xml
+feed/main.atom
+feed/main.xml