Add yii\bootstrap\ActiveForm to the bootstrap guide

http://www.yiiframework.com/forum/index.php/topic/53430-appasset-questions-getting-404-error-on-asset-files/page__gopid__246055#entry246055

Fixes #3066: `yii\db\mssql\Schema::getTableSchema()` should return null when the table does not exist.

Update ActiveQuery.php

PHPDoc comment does not match function or method signature
Update PHPDoc Comment

Adjust code standard

Replaced `clearAll()` and `clearAllAssignments()` in `yii\rbac\ManagerInterface` with `removeAll()`, `removeAllRoles()`, `removeAllPermissions()`, `removeAllRules()` and `removeAllAssignments()`

Implement new RBAC PhpManager

Update ActiveRelationTrait.php

Update gii guide.

Hide debug toolbar when media = print

Update model.md

Add `whenClient` description

fix https://github.com/yiisoft/yii2/issues/3050

fixes for https://github.com/yiisoft/yii2/issues/951#issuecomment-25934549

Fixes #3091: Fixed inconsistent treatment of `Widget::run()` when a widget is used as a container and as a self-contained object

updated appd-advanced.md

added predefined path aliases of advanced yii application template

1xx status is not that common.

small typos changes

Some fixes for #3074 Hungarian translation

without this the form does not allow choosing a different connection id

if component id is different from 'db'

Update apps-advanced.md

just a type correction and suggestion on adding a comma and one word (ie 'by') to make it more easily to be understand.