0.3.1

• add methods for calcing height with custom protype cell or protype nib
• fix bug : sometimes cell.width changed, but the cache has not removed, so we
  must check whether it is dirty.
• MLAutoRecordFrameTableViewCell binds a property named indexPath by dequeueReusableCellWithIdentifier:forIndexPath:. Because sometimes indexPathForCell or indexPathForRowAtPoint cant find correct indexPath of cell in layoutSubviews.