Merge branch 'hotfix/4555'

Close #4555
[2.2.2] Prepare for release

- Updated README
- Added 2.2.2 changelog
- Updated VERSION
Merge branch 'releases/2.2.2'

2.2.2 readiness
Merge branch 'releases/2.2.2' into develop

2.2.2 Changelog

Conflicts:
	README.md
	library/Zend/Version/Version.php
Bump to next maintenance development version

- 2.2.3dev
Merge branch 'version/bump' into develop

Bump to next dev version

Conflicts:
	README.md
	library/Zend/Version/Version.php