Correct presenter incremental bullet dimming
Correct presenter incremental bullet dimming

Fixes #314
wanix/showoff,slambert/showoff,berkes/showoff,berkes/showoff,berkes/showoff,puppetlabs/showoff,wanix/showoff,puppetlabs/showoff,marrero984/showoff,slambert/showoff,kublaj/showoff,kublaj/showoff,berkes/showoff,slambert/showoff,kublaj/showoff,slambert/showoff,marrero984/showoff,binford2k/showoff,binford2k/showoff,wanix/showoff,binford2k/showoff,puppetlabs/showoff,kublaj/showoff,binford2k/showoff,marrero984/showoff,puppetlabs/showoff,berkes/showoff,kublaj/showoff,marrero984/showoff