updated AUTHORS and CHANGELOG

These updates are to reflect the changes that have been
backported into the 1.8.0 release candidate.

Change-Id: I9b2abb9809fa6715a427dc0dbe0474aba140a596
(cherry picked from commit 602bf524b8db31171e70c6a94a66c025d20f021c)
Merge "updated AUTHORS and CHANGELOG" into milestone-proposed