Sha1 Ref implemented
default implementation of iterateHash fixes #23
Sha1 TH helpers added
Loosened dependency for base
Hash Instance moved to R.H.Instances
standard Strings added for SHA1 hash check
Warning fixups
ShaTH moved to Sha1TH
Sha256 implementation added
Sha256 tests added
sha224 implementation added
sha224 tests added
sha512 ref implementation added
Sha512 tests added
Sha 384 implementation added
Sha384 tests added
got rid of some old files
optimised a B.replicate away
Merge branch 'hash-sha'

* Implementation of sha1, sha256, sha512, sha224 and sha384