Session proposal: What's New in Gerrit 2.12

Based on the "What's Coming in 2.12" session from last year's summit
with updates to reflect what was actually released.

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+# What's New in Gerrit 2.12
+
+Overview of the new features included in Gerrit version 2.12.
+This is based on "What's coming in 2.12" that was presented in the
+2015 summit, with updates to reflect what was actually released.
+
+*David Pursehouse, CollabNet*