Specify row class

[et]

I'd like to be able to specify the row's class.
A possible use case would to differentiate user's that are not active.

Example:
Say I have 3 users, and Bob's account has not been activated.
Then I would like the output to be:

<table id="users">
  <thead>
    <tr>
      <th>Name</th>
      <th>Email</th>
    </tr>
  </thead>
  <tbody>
    <tr class="post odd" id="post_1">
      <td>Alice</td>
      <td>[email protected]</td>
    </tr>
    <tr class="post even inactive" id="post_2">   <-------- Note the extra "inactive" class added to this row.
      <td>Bob</td>
      <td>[email protected]</td>
    </tr>
    <tr class="post odd" id="post_3">
      <td>Carol</td>
      <td>[email protected]</td>
    </tr>
  </tbody>
</table>