Preg match's /e modifier is deprecated in PHP 5.5

In PHP 5.5 you'll get the following error:
´preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead´
I found three uses of the /e modifier which I changed with `preg_replace_callback`. I made tests and it worked as expected:

    $str = '
    /* Replace text-shadow:0; with text-shadow:0 0 0; */
    text-shadow:0;
    
    /* Replace background-position:0; with background-position:0 0; */
    background-position:0;
    
    /* border: none to border:0, outline: none to outline:0 */
    border: none;
    outline: none;
    ';
    $css = new Minifier\Cssmin();
    echo $css->run($str);

Outputs:
`text-shadow:0 0 0;background-position:0 0;border:0;outline:0;`