Add slides for Scaling Gerrit and Multimaster

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 ## 9:50 am Scaling Gerrit at Ericsson
 
+[Slides](https://storage.googleapis.com/gerrit-talks/summit/2015/Scaling-Gerrit-Ericsson.pdf)
+
 *Vladimir Cantiru, Ericsson*
 
 ## 10:30 am Scaling Gerrit: active-active masters
 
+[Slides](https://storage.googleapis.com/gerrit-talks/summit/2015/Multimaster-Gerrit.pdf)
+
 *Shawn Pearce, Google*
 
 ## 11:00 am Break