title: Why is SDWebImage with UITableView causing exception?
body: <p>I'm a noob to iphone development and I am trying to implement the SDWebImage library into my project.  My project builds fine, however it when I display my tableview my app crashes with an invalid argument exception.  I followed the installation instructions thoroughly.  I added the ImageIO framework, added the -fobjc-arc flag since my project is non-ARC, and imported the appropriate header.  Any help is greatly appreciated.</p>
  
  <p>MY Exception</p>
  
  <pre><code>'NSInvalidArgumentException', reason: '-[UIImageView setImageWithURL:placeholderImage:]: unrecognized selector sent to instance 0x6e47d50'
  </code></pre>
  
  <p>My Code</p>
  
  <pre><code> // Customize the appearance of table view cells.
  - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
  
  static NSString *CellIdentifier = @"Cell";
  
  UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
  if (cell == nil) {
      cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
  }
  
  //Lazy Loader
  [cell.imageView setImageWithURL:[NSURL URLWithString:@"http://www.domain.com/path/to/image.jpg"]
                 placeholderImage:[UIImage imageNamed:@"mylogo.png"]];
  
  // Configure the cell...
  
  NSDictionary *aTweet = [tweets objectAtIndex:[indexPath row]];
  
  cell.textLabel.text = [aTweet objectForKey:@"text"];
  cell.textLabel.adjustsFontSizeToFitWidth = YES;
  cell.textLabel.font = [UIFont systemFontOfSize:12];
  cell.textLabel.minimumFontSize = 10;
  cell.textLabel.numberOfLines = 4;
  cell.textLabel.lineBreakMode = UILineBreakModeWordWrap;
  
  cell.detailTextLabel.text = [aTweet objectForKey:@"from_user"];
  
  NSURL *url = [NSURL URLWithString:[aTweet objectForKey:@"profile_image_url"]];
  NSData *data = [NSData dataWithContentsOfURL:url];
  cell.imageView.image = [UIImage imageWithData:data];
  cell.selectionStyle = UITableViewCellSelectionStyleNone;
  return cell;
  }
  </code></pre>