remove special case for plenary in feed
remove special case for plenary in feed

when plenaries have presentations assigned, they
will now be included in the json feed
PyCon/pycon,smellman/sotmjp-website,eldarion/pycon,Diwahars/pycon,Diwahars/pycon,njl/pycon,pyconjp/pyconjp-website,osmfj/sotmjp-website,njl/pycon,eldarion/pycon,pyconjp/pyconjp-website,smellman/sotmjp-website,PyCon/pycon,smellman/sotmjp-website,pyconjp/pyconjp-website,njl/pycon,smellman/sotmjp-website,osmfj/sotmjp-website,Diwahars/pycon,PyCon/pycon,njl/pycon,pyconjp/pyconjp-website,PyCon/pycon,Diwahars/pycon,osmfj/sotmjp-website,osmfj/sotmjp-website,eldarion/pycon