util.inflate_aggregator function
Stripping down the currently-allowed set of config values
Less choking on missing attributes in aggregator output

* What we really need is a utility function that can properly reconsitute
  content from an atom feed, possibly as part of a library that can
  generate an atom feed from feedparser output, but this will do in
  a pinch
* Additionally, we should figure out what to do for missing values in
  our aggregator behavior, but again this works for the moment

  this into "what we really mean