Added tracking of killed workers.
	new file:   db/migrate/20141031190631_add_feeditem_died.rb
	modified:   db/schema.rb
	modified:   lib/services/worker/worker.rb
Bump cull limit to 300
Merge branch 'master' of github.com:cloudspace/rss.cloudspace.com
Removed "process killed" modification.
Merge branch 'master' of github.com:cloudspace/rss.cloudspace.com