[ready]Added Bootstrap Nav and NavBar widgets 367 bootstrap nav

issue #439

* 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

It allows to filter actions by HTTP request methods

added decimalSeparator and thousandSeparator properties.
issue #48

Fixed some wording

Added missing use statement.

ensure lines are aligned right:
```
 7
 8
 9
10
11
12
...
```

Fixes #373

fixes #429

\yii\rbac\DbManager::isAssigned() signature fix