Debugger: database panel WIP
debugger furnishing
Removed test code.
debugger minmax wip
Implemented minimize and maximize of debugger toolbar.
finished debugger.
minor fixes.
Minor fixes.
normalize header names.
Added DataProvider and IDataProvider.
Merge branch 'master' of github.com:yiisoft/yii2
Added support for using callables as "ActiveQuery::indexBy".