- In SeekableUnicodeStreamReader._read(), if size=0, then just return   the empty string immediately.  This prevents a minor discrepency   issue with skipping over the byte order marker.
- In SeekableUnicodeStreamReader._read(), if size=0, then just return
  the empty string immediately.  This prevents a minor discrepency
  issue with skipping over the byte order marker.


svn/trunk@5891

nltk/nltk,nltk/nltk,nltk/nltk