Add an Alert for non-supported browsers

[nick1n]

Such as IE6, IE7, and IE8

[namklabs]

Can we add an insulting alert?

[nick1n]

Maybe something like this: (minus that first space)

< !--[if lt IE 9]>
  <div class="alert alert-error offset4 span6">
    <button type="button" class="close" data-dismiss="alert">×</button>
    <strong>Warning!</strong>
    This browser isn't fully supported, please update to a new browser.
  </div>
<![endif]-->