How would I convert an RSS feed into an ebook? I know that [calibre](http://calibre-ebook.com/) can already do this but it is a bit bulky and I don't feel confident [writing a recipe in Python](http://manual.calibre-ebook.com/news.html) to try to do this. I do have access to [pandoc](http://johnmacfarlane.net/pandoc/) and other tools on Linux, though.