Update blog layout

- only one column for entries
- back link added to the bottom of an entry
- remove unnecessary HTML elements
Add style for warning box in docs
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'
Fixed the ZF doc for ver. <= 1.10
Added ZendCon promo banner

- Had to update CSS so that divider was correctly sized to right-content
Merge branch 'hotfix/zendcon-promo'
Fixed the manual.html request for ZF 1.9 and 1.10 docs
Merge remote-tracking branch 'zf-web/master' into fix/old_zf1_docs
Fixed ZF docs for 1.9 and 1.10
Added XML sitemap module. Updated manual module to use a new custom route type so its URLs will work in the XML sitemap
Removed a couple of code references which are no longer used
Merge pull request #104 from ezimuel/fix/old_zf1_docs

Fix/old zf1 docs
Merge branch 'hotfix/104'

Close #104
Replaced hero banner with ZF2A promotion
Merge branch 'hotfix/zf2a-banner'
Fix for hover of promo image