missing style for .clear divs cause clearfix issues in IE7

The 960gs makes heavy use of a technique to clear floating divs using an empty <div class="clear"></div>. This theme is missing the .clear directive found in 960gs' CSS (snippet below), which causes display issues in older browsers with certain types of layouts.

/* `Clear Floated Elements
----------------------------------------------------------------------------------------------------*/

/* http://sonspring.com/journal/clearing-floats */

.clear {
  clear: both;
  display: block;
  overflow: hidden;
  visibility: hidden;
  width: 0;
  height: 0;
}

Patch to follow...