public function unregister($alias)
    {
        $this->_collection->remove($alias);
        $this->remove($alias);
        return $this;
    }
public function unregister($alias)
    {
        $this->_collection->remove($alias);
        $this->remove($alias);
        return $this;
    }
public function unregister ( $ alias ) { $ this -> _collection -> remove ( $ alias ) ; $ this -> remove ( $ alias ) ; return $ this ; }
Unregisters an asset from collection.

@param string $alias
@return $this
Unregisters an asset from collection .