0.0.1, repairing erroneous selection

If for some reason the database had an invalid count of selected elements, it wouldn't get fixed unless a new selection was added.

This patch now validates the integrity of the selection even when an already selected element is saved.

First stable release

This initial release supports the following config array

$this->addBehavior('Multiselect.Multiselect', [
    'featured' => [
        'state' => true, 
        'scope' => ['author_id'],
        'limit' => 2,
        'order' => [
            'approved' => 'ASC',
            'modified' => 'ASC',
        ],
    ],
]);