.config/rss2email.cfg: Update defaults for rss2email v3.6+

Although I doubt any other config changes will land before v3.7.
.config/rss2email.cfg: Diego's feed is now redirecting to HTTPS

  $ wget -S http://blog.flameeyes.eu/articles.atom
  ...
    HTTP/1.1 301 Moved Permanently
    ...
    Location: https://blog.flameeyes.eu/articles.atom

Rss2email picks up on the 301 (in Feed._check_for_errors) and updates
the URL automatically :).
.config/rss2email.cfg: Add Gary Rowe's Agile Stack blog

While reading up on AtomPub, I ran across Gary's post [1], which was a
good read.  Hopefully there will be more where that came from :).

[1]: http://gary-rowe.com/agilestack/2012/06/08/multibit-merchant-open-the-pod-bay-doors-hal/
.config/rss2email.cfg: Update URLs for Greg's Third Bit blog

I'm not sure why he moved them without redirects...
.config/rss2email.cfg: Override name-format for several feeds

These are either feeds that don't define an author, or ones that use
verbose feed titles (crowding out the author information).