Second Example should start with ProgressBar::begin not ProgressBar::widget

Refactored ActiveRecord::find() so that find(null) will also return an ActiveRecord instance instead of ActiveQuery.

fixes #1946

Fixes #2912: Relative view files will be looked for under the directory containing the view currently being rendered

issue #2892

so information about changed values is available in `afterSave`-event.

fixes #2892

Simplify inline script code (removed extra space)

Correct classname to `BaseOAuth` instead of `BaseClient` in PHP Doc.

Simplify the rendering of the inline script (using direct markup), eliminating need for using PHP variable to store value using HEREDOC.