Proposal: Update references to FIPS PUB 180

Proposal: Update SHA references to FIPS PUB 180 Specifically * update Section 1.2 Definitions for each SHA algorithm to reference FIPS PUB 180-4. * update all digest specific sections such as 2.17.2, 2.19.2, 2.20.2, and 2.21.2 * add a reference to FIPS PUB 180-4 in section 2.18.2, (currently says “…digest as defined in 0.”). * remove all references to RFC 3874, which is redundant to FIPS 180-4. Thanks, Bob Robert Burns Security Principal THALES Information Systems Security
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