Release 2.2.2.
More release notes.
Merge branch '2.2.2_2.9' into 2.2.2_2.10
Bump to 2.2.3-SNAPSHOT.
Merge branch '2.2.x_2.9' into 2.2.x_2.10
Merge branch '2.2.x_2.10' into 2.3.x_2.10

Conflicts:
	version.sbt
Release notes for 2.3.0.M1.