updated composer docs

Mistake in error message

{max} was used instead of {min} in the error message for the min validator...

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

Finnish translation

small typo fix

fixes #2765

small typo fix

change usual code style to php code style

Fixes #497: Removed `\yii\log\Target::logUser` and added `\yii\log\Target::prefix` to support customizing message prefix

fix GridView filterUrl bug

GII generated files changes according to PSR2

- readded removed file
- readded use statement to migration template

typo fix in gii.md

Fixed typo in FilterValidator for skipping array values.

Reformat code to be PSR-2 compatible