GridView WIP
ActiveRecord::getNamespacedClass() call style
Avoid logging db errors repeatedly.
fixes #684
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.
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Display debug toolbar on error pages.
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.
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()
Refactored ActiveDataProvider.
Fixes #709.
Fixes #711.