title: RTLabel issue (Number of Line) & NSLineBreakByTruncatingTail
body: <p>I am using RTLabel from <a href="https://github.com/honcheng/RTLabel" rel="nofollow noreferrer">https://github.com/honcheng/RTLabel</a>, I need to give Number of lines(at list 4 lines) and after set lineBreakMode as NSLineBreakByTruncatingTail. </p>
  
  <p>How can i set this...?</p>