PSR-2 : add space between for, if, do(..) while, while and open parentheses
Added accessor for validation group
Added tests
Merge commit 'refs/pull/3826/head' of github.com:zendframework/zf2 into hotfix/cs
Merge commit 'refs/pull/3861/head' of github.com:zendframework/zf2 into hotfix/add-getter-form-validationgroup
[#3861] micro optimization