• added "portable" option to shasum
  -- to make digests match across Windows/Unix/MacOS
  
• enabled bundling of shasum command line options
  -- to mimic behavior of md5sum
  
• removed \r's from text files in t/nist directory
  -- resolves SIGNATURE clashes (rt.cpan.org #18983)
  
• changed suffix on SHA64_MAX (src/sha.h) to ULL
  -- eliminates gcc warnings (rt.cpan.org #18988)
  
• specified minimum Perl version for module and Makefile.PL
  -- closes rt.cpan.org #18984