• $feed->author wasn't being converted properly by Feed->convert. Thanks
  to Tatsuhiko Miyagawa for the patch.
  
• Added eval around Entry->issued calls, to properly catch invalid
  date formats, and just return undef, rather than dying. Thanks to
  Tatsuhiko Miyagawa for the spot.
  
• Fixed issued/modified format issue with dates in timezones other than
  UTC. Thanks to Tatsuhiko Miyagawa for the patch.