title: Amazon S3 concatenate small files
body: <p>Is there a way to concatenate small files which are less than 5MBs on Amazon S3.
  Multi-Part Upload is not ok because of small files.</p>
  
  <p>It's not a efficient solution to pull down all these files and do the concatenation.</p>
  
  <p>So, can anybody tell me some APIs to do these?</p>