close #5838

Just a readme update.
"If you do not want any hidden input, you should explicitly set this option as null."

close #5823

close #5762

Fixes #5735: Added `yii\bootstrap\Tabs::renderTabContent` to support manually rendering tab contents

Revert "Fixes #3760: Gii model generator now imports classes when necessary instead of using fully qualified class names"

This reverts commit 0c8faedd.

Fixes #3760: Gii model generator now imports classes when necessary instead of using fully qualified class names

Fixes #5682: The `asset` command would incorrectly combine CSS files when `UrlManager::linkAssets` is true

Fixes #5570: `yii\bootstrap\Tabs` would throw an exception if `content` is not set for one of its `items`
Fixes #5572.

Fixes #5665: The `currentPage` meta data in the RESTful result should be 1-based, similar to that in HTTP headers

#4471: `yii\caching\ApcCache` now returns array in case of APC is installed but not enabled in CLI mode