Add license header for Minio modifications, improvements for sha1,sha256,sha512 implementations

Also bring in SSE3 optimized public domain implementation of SHA1 from Intel ``FIPS PUB 180-1``

pkg/utils/crypto/sha1/sha1_test.go

@@ -1,3 +1,12 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file of
+// Golang project:
+//    https://github.com/golang/go/blob/master/LICENSE
+
+// Using this part of Minio codebase under the license
+// Apache License Version 2.0 with modifications
+
 // SHA1 hash algorithm.  See RFC 3174.
 
 package sha1