Merge pull request #865 from weierophinney/feature/2.2-service-managers

Documentation for Abstract Factories introduced in 2.2.0
Merge pull request #864 from weierophinney/feature/validator-updates

Update Validator documentation for 2.2
Add missing doctypes
Add note for form view helpers
Merge pull request #866 from froschdesign/hotfix/doctype-helper

Add missing doctypes for view helper
Merge branch 'hotfix/866'

Close #866
Merge branch 'hotfix/866' into develop

Forward port #866
Merge pull request #867 from froschdesign/hotfix/view-helpers

Add note for form view helpers in Zend\View chapter
Merge branch 'hotfix/867' into develop

Forward port #867