Log Message:
Update to 5.48:

5.48  Mon Jan  4 16:32:52 MST 2010
	- fixed "shasum -a0" option (ref. rt.cpan.org #53319)
		-- incorrectly accepted 0 as a valid algorithm
			-- thanks to Zefram for patch
	- updated URL for NIST test vectors
		-- ref. files t/nistbit.t, t/nistbyte.t
			-- thanks to Leon Brocard for patch