Tag release-2.1.8-stable

Merge branch 'release-2.1.8-stable-pull'

* release-2.1.8-stable-pull:
  Bump version to 2.1.8-stable everywhere
  VERSION_INFO should me equal to library version
  Bump whatsnew-2.1 document
  Update ChangeLog for 2.1.8-stable
  README: update AUTHORS

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Commit e7ff4ef2
Author Azat Khuzhin
Date 2017-01-26T02:37:15