Only initialize the stats system when presenting
Only initialize the stats system when presenting

This prevents the spurious creation of `stats` directories when running
`showoff --version`, for example.

slambert/showoff,marrero984/showoff,marrero984/showoff,wanix/showoff,berkes/showoff,slambert/showoff,slambert/showoff,kublaj/showoff,marrero984/showoff,berkes/showoff,puppetlabs/showoff,slambert/showoff,wanix/showoff,wanix/showoff,kublaj/showoff,puppetlabs/showoff,kublaj/showoff,kublaj/showoff,marrero984/showoff,binford2k/showoff,binford2k/showoff,berkes/showoff,berkes/showoff,puppetlabs/showoff,berkes/showoff,binford2k/showoff,kublaj/showoff,puppetlabs/showoff,binford2k/showoff