issue #3026

fixes #3034

Fixes #2955: Changed the signature of ActiveQuery constructors and `ActiveRecord::createQuery()` to simplify customizing ActiveQuery classes

fixes #2887

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