title: UIMenuController with custom item not working with UICollectionview
body: <p>I have added custom menu controller when long press on UICollectionViewCell</p>
  
  <pre><code>    [self becomeFirstResponder];
      UIMenuItem *menuItem = [[UIMenuItem alloc] initWithTitle:@"Custom Action"
                                                        action:@selector(customAction:)];
      [[UIMenuController sharedMenuController] setMenuItems:[NSArray arrayWithObject:menuItem]];
      [[UIMenuController sharedMenuController] setTargetRect: self.frame inView:self.superview];
      [[UIMenuController sharedMenuController] setMenuVisible:YES animated: YES];
  </code></pre>
  
  <p>canBecomeFirstResponder Is also being called</p>
  
  <pre><code>- (BOOL)canBecomeFirstResponder {
      // NOTE: This menu item will not show if this is not YES!
      return YES;
  }
  </code></pre>
  
  <p>//This method is not being called</p>
  
  <pre><code>- (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
      NSLog(@"canPerformAction");
      // The selector(s) should match your UIMenuItem selector
      if (action == @selector(customAction:)) {
          return YES;
      }
      return NO;
  }
  </code></pre>
  
  <p>I have Also Implemented these methods</p>
  
  <pre><code>- (BOOL)collectionView:(UICollectionView *)collectionView
        canPerformAction:(SEL)action
      forItemAtIndexPath:(NSIndexPath *)indexPath
              withSender:(id)sender {
  
  
      if([NSStringFromSelector(action) isEqualToString:@"customAction:"]){
          NSLog(@"indexpath : %@",indexPath);
          UIAlertView *alertview = [[UIAlertView alloc] initWithTitle:@"warning.." message:@"Do you really want to delete this photo?" delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
          [alertview show];
          return YES;
      }
  
      return YES;
  
  }
  
  - (BOOL)collectionView:(UICollectionView *)collectionView shouldShowMenuForItemAtIndexPath:(NSIndexPath *)indexPath {
      return YES;
  }
  
  - (void)collectionView:(UICollectionView *)collectionView
           performAction:(SEL)action
      forItemAtIndexPath:(NSIndexPath *)indexPath
              withSender:(id)sender {
      NSLog(@"performAction");
  }
  </code></pre>
  
  <p>Though it is showing only "cut, copy, and paste" menus</p>