For those who don't know, Reddit provide feeds at URLs like `/r/foo/.rss` (although they're actually Atom...) Annoyingly this doesn't work when combining subre

For those who don't know, Reddit provide feeds at URLs like `/r/foo/.rss` (although they're actually Atom...) Annoyingly this doesn't work when combining subreddits, e.g. `/r/foo+bar+baz` is HTML containing posts from those three subreddits, but `/r/foo+bar+baz/.rss` only includes posts from one :(