TMQuiltView memory leak

[haitaoli]

dealloc code releases _reusableViewsDictionary first, but then cleanupColumns code path will re-create the dictionary and leak all objects in it. The fix is to move cleanupColumns to the beginning of dealloc.

• (void)dealloc {
  [_indexPaths release], _indexPaths = nil;
  [_reusableViewsDictionary release], _reusableViewsDictionary = nil;
  [_rowsToInsert release], _rowsToInsert = nil;
  [_rowsToDelete release], _rowsToDelete = nil;

  [self cleanupColumns]; <== leaks _reusableViewsDictionary

  [self removeGestureRecognizer:self.tapGestureRecognizer];
  [_tapGestureRecognizer release], _tapGestureRecognizer = nil;

  [super dealloc];
  }