Merge branch 'feature/862' into develop

Forward port #862
Merge branch 'releases/2.2.0rc3' into develop
Merge branch 'hotfix/863' into develop

Forward port #863
Merge branch 'hotfix/navigation-use-route-match-note' into develop

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

PR #865
Merge commit 'refs/pull/864/head' of github.com:zendframework/zf2-documentation into develop

PR #864
Merge branch 'hotfix/866' into develop

Forward port #866
Merge branch 'hotfix/867' into develop

Forward port #867
Merge branch 'releases/2.2.0' into develop

2.2.0 readiness

Conflicts:
	docs/languages/en/conf.py
Merge branch 'version/bump' into develop

Conflicts:
	docs/languages/en/conf.py
Merge branch 'hotfix/871' into develop

Forward port #871
Merge branch 'hotfix/870' into develop

Forward port #870
Merge branch 'hotfix/870' into develop

Fix rendering issue in table
fix typos
added docs for https://github.com/zendframework/zf2/pull/3990
Update zend.mail.attachments.rst

Rewrote the whole page since it was just a copy of ZF1 docs with namespaces.
correct some class names
saveAlbum() accepts Album class, not an array
Closed ')'
Merge branch 'hotfix/#880'

Close #880