* upstream:
  typo in Html helper
  Created a \yii\web\VerbFilter
  Implemented MaskedInput widget.
  Use class constants for Event declatration in ActionFiler
  Removed unused method.
  Updated requirements about yii\i18n\Formatter
  refactored numberformatting in base\Formatter
  Fixes issue #439
  Fixed typos in new Formatter classes
  Fixes issue #441: InvalidRequestException should be HttpException
  Removed breaking tests.
  Removed breaking test.
  Added "formatter" app component.
  Finished Formatter.
  formatter WIP.
  Added missing use statement.
  Fixed some wording