Extend the plugin to remove even more

Thank you for this great module – it helps me a lot!
But when pasting text and tables from Word or rich text files i still have clutter, i don't want to see – so i extended your plugin to remove even more stuff, like "class", "font" or "valign".

Before:

<p><font face="HP Simplified">Some text</font>
</p>
<table class="MsoTableGrid">
  <tbody>
    <tr>
      <td valign="top">
        <p class="MsoNoSpacing">Some more text.</b>
        </p>

After:

<p>Some text
</p>
<table>
  <tbody>
    <tr>
      <td>
        <p>Some more text.</b>
        </p>