Wrote release announcement for 2.2.1
[2.2.1] release readiness
Merge branch 'hotfix/release-2.2.1'
Updated to 2.2.1

- Ensured console works (following report on issue tracker)
Merge branch 'hotfix/zf2-2-1-update'
Added ZendCon promo banner

- Had to update CSS so that divider was correctly sized to right-content
Merge branch 'hotfix/zendcon-promo'
Merge remote-tracking branch 'zf-web/master' into fix/old_zf1_docs