Prepping module for 2.2.0 release.

Updated Modulefile to version 2.2.0. Updated README.md with
latest release notes.

Change-Id: I9aab1c3ff9b5f801dd496c4947cba81fe4f879ac
(cherry picked from commit 4100e958fdecebe6eb486c8a09ba6954bcae5d71)