title: Animate the insertion of a new section in UITableVIew
body: <p>I have this button on my view, and when I press it I insert a new section in my table view ( I have a logical condition in my </p>
  
  <pre><code>-(NSInteger) numberOfSectionsInTableView:(UITableView*)tableView
  {
      if (slide==TRUE) return 2;
      return 1;
  }
  </code></pre>
  
  <p>And also in my <code>-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath</code>. My section is added as it should, but I have read somewhere that this can be animated, because when I press my button the section is added but with no animation. I think I should use this <code>-(void)insertSections:(NSIndexSet*)sections withRowanimation(UITableViewRowAnimation) animation</code> but I haven't found a proper example on the web.</p>