Avoid logging db errors repeatedly.
fixes #684
Merge branch 'master' of github.com:yiisoft/yii2
Fixed the issue that ActiveQuery::one() doesn't bring back related objects when asArray is true.
Renamed DataColumn::type to format.
Added GridView::dataColumnClass.
Add encodeLabels configure

Please, review and approval.
Thanks
Merge pull request #707 from yiidevelop/patch-2

Add encodeLabels configure
Display debug toolbar on error pages.
Merge branch 'master' of github.com:yiisoft/yii2
requirements: fixed intl version checking
fixed length constraints check to always result in correct range
added note about routes for camelCased controllers and actions
Removed placeholders.
Merge branch 'master' of github.com:yiisoft/yii2
Added status code display to debugger toolbar.
Reorganized captcha code.