title: Stream which implements a Seek method
body: <p>I'm trying to find an interface which allows me to create a stream which allows seeking (just a Reader is fine, too) from either a file or <code>[]byte</code>, but can't seem to find anything in the godoc. Some of the types in the <code>bufio</code> package would work quite well, but they don't appear to support seeking.</p>
  
  <p>Is there something I overlooked which would fit what I'm looking for?</p>