optimize imports
run ffprobe once and store all of the media in the post mime type worker
more clearly start with head pointing to id=0
report max active and waiting counts
only run video post mime worker on videos
update media ontology and propery configuration docs
update to new secure graph
Merge branch 'master' of github.com:lumifyio/lumify
Merge branch 'audit-term-to-vertex' into term-to-vertex