Refactored formatter class #2359 which works with or without intl extension. Use PHP format patterns alsow with intl. Class is compatible with previous version.

fixed note about search class

File validator adjusted

Russian guide. Start forms

\yii\i18n\DbMessageSource code style fixes

Excess \yii\base\Model::resolveFields() method removed

Fix .gitignore for `basic` and `advanced` application templates

Fix #3756: Convert values to float for number formatting

Fixed duplicate error message when client validation is enabled. Fixes #3740. [skip ci]

Convert string values to floating point, so that `number_format` method can properly format values.

Application templates tests fixed

refactored logger to support array values out of the box.

* 'master' of https://github.com/makroxyz/yii2:
  Fix PostgreSQL enumValues

fixes #3244

fixes #3245, #3244