checkBoxControlGroup generate wrond 'for' label attibure

[Alexey Muravyov]

function checkBoxControlGroup use $name to generate 'for' label attribute. It is wrong way. We must check that 'for' attribute isn't set in labelOptions, and then check that attribute 'id' isn't set in htmlOptions.

public static function checkBoxControlGroup($name, $checked = false, $htmlOptions = array())

.... $labelOptions['for'] = parent::getIdByName($name);