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.
Minor doc and messages fixes [skip ci]
Some doc code cleanup [skip ci]
Reorganized captcha code.
renamed IDataProvider::getItems() to getModels()
Merge pull request #708 from lucianobaraglia/master

Minor doc and messages fixes [skip ci]
Refactored ActiveDataProvider.
Fixes #709.
Fixes #711.
Fixes #704.
Added support for passing parameters to the format method.
Fixes #713.