Update documentation for crc32c, cpu

pkgs/checksum/crc32c/Makefile

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+all: build test
+.PHONY: all
+
+build:
+	@godep go build
+
+test: build
+	@godep go test -race -coverprofile=cover.out
+
+clean:
+	@rm -v cover.out

pkgs/checksum/crc32c/doc.go

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+// Package crc32c provides wrapper around Intel's fast CRC32C with PCLMULQDQ instructions.
+// The white papers on CRC32C calculations with PCLMULQDQ instruction can be downloaded from:
+//
+// http://www.intel.com/content/dam/www/public/us/en/documents/white-papers/crc-iscsi-polynomial-crc32-instruction-paper.pdf
+// http://www.intel.com/content/dam/www/public/us/en/documents/white-papers/fast-crc-computation-paper.pdf
+//
+// Example
+//
+// crc32c.Crc32c(value) - value can be any []byte, return value is uint32 value
+package crc32c

pkgs/checksum/sha1/Makefile

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+all: build test
+.PHONY: all
+
+build:
+	@godep go build
+
+test: build
+	@godep go test -race -coverprofile=cover.out
+
+clean:
+	@rm -v cover.out