title: Bootstrap - Do you need .col-*-12 within .row?
body: <p>I'm looking to understand if you should <strong>always</strong> include an element with class <code>col-lg-12</code> (or <code>md</code>, <code>sm</code>, etc., of course) within an element with class <code>row</code>.  Or if you only need to be consistent one way or another.</p>
  
  <p>If you were inconsistent, is the only issue that you'd wind up with some padding differences as seen in this <a href="http://plnkr.co/edit/NATqKq51EWeHGu0VqBg7?p=preview" rel="nofollow">plunker</a>?  The second row - the one whose immediate child has the class <code>col-lg-12</code> - has a <code>padding-left</code> and <code>padding-right</code> set at 15px whereas the first row does not.</p>