Added ability to add attributes to html() method

Added ability to add attributes like `id` , `class`, `alt` to html() method
Uses

    Image::open('open.jpg')
     ->html($title = 'some title', $type = 'jpg' , array('class'=>'test pull-right','id'=>'test','alt' => 'name')));

`NULL` can also be provided if don't want any attributes just want to change the image quality