title: wp_nav_menu() doesn't assign ul class
body: <p>Using <code>wp_nav_menu()</code> doesn't seem to allow me to properly assign a class to my <code>ul</code> element. Here's my code for the menu:</p>
  
  <pre><code>wp_nav_menu( array( 
      'container' =&gt; false,
      'menu_class' =&gt; 'nav navbar-nav navbar-left',
      'theme_location' =&gt; 'primary'
  ) );
  </code></pre>
  
  <p>The issue is that this keeps assigning my menu classes as container classes, even though I've tried setting container to false and to <code>''</code>. This ends up being my navbar html:</p>
  
  <pre><code>&lt;div class="nav navbar-nav navbar-left"&gt;
    &lt;ul&gt;
      &lt;li class="page_item page-item-31"&gt;&lt;a href="https://wordpress-c9-bradydowling.c9.io/?page_id=31"&gt;Contact Us&lt;/a&gt;&lt;/li&gt;
      &lt;li class="page_item page-item-5"&gt;&lt;a href="https://wordpress-c9-bradydowling.c9.io/?page_id=5"&gt;My Little Page&lt;/a&gt;&lt;/li&gt;
      &lt;li class="page_item page-item-2"&gt;&lt;a href="https://wordpress-c9-bradydowling.c9.io/?page_id=2"&gt;Sample Page&lt;/a&gt;&lt;/li&gt;
    &lt;/ul&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>Here's the <a href="https://gist.github.com/bradydowling/782925c69c8d4a3b9e20" rel="nofollow">gist of my full header.php</a> file in case that's relevant. According to the <a href="https://developer.wordpress.org/reference/functions/wp_nav_menu/" rel="nofollow">wp_nav_menu docs</a>, this seems exactly the way I should be calling it.</p>
  
  <p>Is there a setting somewhere or a version of a certain plugin that could be messing things up? Does it matter that I'm updated to Wordpress 4.4.2?</p>