Updated documentation to 2.2

- Added big note about changes in 2.2 for translation
- Updated references to Zend\I18n\Translator\Translator to either
  Zend\Validator\Translator\TranslatorInterface or Zend\Mvc\I18n\Translator.
Documented new abstract service factories

- Largely refactored the document to give an overview of service types, add the abstract factories
  section, and another section on plugin managers.
Updated language for EventManager description

- per @EvanDotPro
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 pull request #867 from froschdesign/hotfix/view-helpers

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

Close #867
Zend Framework 2.2.0
Merge branch 'releases/2.2.0'

2.2.0 readiness
Bump to 2.2.1dev
Merge branch 'version/bump'

Bump to 2.2.1dev
Added DDL section
Added Literal vs. Expression to SQL section
Update zend.mvc.routing.rst

Typo in namespace
Merge pull request #871 from ecolinet/patch-1

Update zend.mvc.routing.rst
Merge branch 'hotfix/871'

Close #871
Fixed formatting of class, variable names in DDL ans SQL pages