Adds GerritHub.io slides to Sat schedule

Change-Id: I45f4318dbc34a2c333bd76819c1af35217f728ea

sat.md

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 *Luca Milanesio, GerritForge*
 
+[Slides](http://www.slideshare.net/lucamilanesio/gerrithubio-present-past-future)
+
 ## 1:00 pm Gerrit in a Windows world
 
 Managing Gerrit in a mostly-Windows environment, and how we've helped