Merge pull request #2760 from AlexGx/fix-gridview-url

fix GridView filterUrl bug
Tab to spaces conversion.
Added $checkSession parameter to User::getIsGuest() and getId().
Fixes #497: Removed `\yii\log\Target::logUser` and added `\yii\log\Target::prefix` to support customizing message prefix
small typo fix

change usual code style to php code style
Merge pull request #2774 from plusodinminus/patch-1

small typo fix
Adjusted code style guide
PSR-2 compliance
fixed detailview attributes

fixes #2765
minor fixes.
doc fix.
Add finnish translation to config
Finnish translation
small typo fix
Merge pull request #2779 from janisto/patch-1

small typo fix
Merge branch 'master' of git://github.com/yiisoft/yii2 into messages_fi
Fix MIME types
Alter image validation messages.
Merge pull request #2780 from janisto/messages_fi

Finnish translation
Fixes #2775: Added `yii\base\Application::bootstrap` to support running bootstrap classes when starting an application