Merge branch 'hotfix/navigation-use-route-match-note'

See zendframework/zf2#4446
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 commit 'refs/pull/865/head' of github.com:zendframework/zf2-documentation into develop

PR #865