Removed padding from container-fluid if inside a modal-body

Created by: rkoch

This PR removes the padding from .container-fluid if it is used inside a modal-body:

e.g:

<div class="modal hide fade" id="someDlg">
  <div class="modal-body">
    <div class="container-fluid"> <!-- Used here.. -->
      <div class="row-fluid">
        ...
      </div>
    </div>
  </div>
</div>