Tag release-2.1.6-beta

Merge branch 'release-2.1.6-beta-pull'

* release-2.1.6-beta-pull:
  Bump version to 2.1.6-beta everywhere
  ChangeLog: Add brief notes
  Update changelog for 2.1.6-beta (ugh, pretty huge)
  Update AUTHORS section in README

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Commit a73fb2f4
Author Azat Khuzhin
Date 2016-08-27T01:53:31