Adds stackable callout icons & a terminal class
Adds stackable callout icons & a terminal class

This adds the ability to stack two FontAwesome icons for a callout using `:before` and `:after`. The `:after` icon is slightly smaller and white so they overlay well.

Also adds a `.callout.terminal` style to use it.
binford2k/showoff,binford2k/showoff,puppetlabs/showoff,puppetlabs/showoff,binford2k/showoff,binford2k/showoff,marrero984/showoff,marrero984/showoff,puppetlabs/showoff,marrero984/showoff,puppetlabs/showoff,marrero984/showoff