title: Query builder not inserting timestamps
body: <p>I am using Query builder to insert data all fields are been inserted but timestamps like created_at and updated_at are not inserting they all have default 0:0:0 values 
  my insert query is</p>
  
  <pre><code>$id = DB::table('widgets')
              -&gt;insertGetId(array(
                  'creator' =&gt; Auth::user()-&gt;id,
                  'widget_name' =&gt; $request-&gt;input('widget_name'),
                  'pages' =&gt; json_encode($request-&gt;input('pages')),
                  'domain' =&gt; $request-&gt;input('domain'),
                  "settings" =&gt; $settings,
              ));
  </code></pre>