public function fit($width, $height, $filename = null)
    {
        $this->fit[] = array('width'=>$width, 'height'=>$height,  'filename'=>$filename);

        return $this;
    }
public function fit($width, $height, $filename = null)
    {
        $this->fit[] = array('width'=>$width, 'height'=>$height,  'filename'=>$filename);

        return $this;
    }
public function fit ( $ width , $ height , $ filename = null ) { $ this -> fit [ ] = array ( 'width' => $ width , 'height' => $ height , 'filename' => $ filename ) ; return $ this ; }
shortcut to ImageManager fit
@param $width
@param $height
@param $filename
@return $this
shortcut to ImageManager fit