Proposed mutex extension.
Uncomment UNIX Mutex.
Mutex extension docblocks and several minor fixes.
composer.json file and proper class files location.
Proper files location.
Mutex cache backend WIP.
Autorelease callback improved, composer.json typo.
Autorelease callback.
Fixes:

1. Proper auto release shutdown callback.
2. Proper Mutex::releaseLock() method.
Mutex WIP.
Added Formatter::nullDisplay.
Added Html::ol() and Html::ul()
cleanup.
encode checkbox and radio list by default.
Added itemOptions for Html::ol
Added Model::load(). Added Controller::refresh() and redirect().
Added Model::loadMultiple() and validateMultiple().
debug toolbar WIP
Improved Json::encode() security.
Enhanced ArrayHelper::toArray()