This runs bigtext() only on the current slide
This runs bigtext() only on the current slide

Prior to this, it embigggened all slides tagged with bigtext on every
slide change. This only runs it on the current slide.

marrero984/showoff,puppetlabs/showoff,binford2k/showoff,slambert/showoff,marrero984/showoff,puppetlabs/showoff,slambert/showoff,puppetlabs/showoff,slambert/showoff,binford2k/showoff,binford2k/showoff,slambert/showoff,puppetlabs/showoff,marrero984/showoff,binford2k/showoff,marrero984/showoff