Added a utility function to decode a CBOR blob into a printable string (#58)

* Added a utility function to decode a CBOR blob into a printable string

* Better naming for decode.go and DecodeCBOR

* Moved readable.go into the main cbornode package

readable.go

+package cbornode
+
+import (
+	"bufio"
+	"bytes"
+
+	cbor "github.com/polydawn/refmt/cbor"
+	"github.com/polydawn/refmt/pretty"
+	"github.com/polydawn/refmt/shared"
+)
+
+//HumanReadable returns a string representation of a CBOR blob
+func HumanReadable(blob []byte) (string, error) {
+	reader := bytes.NewReader(blob)
+
+	var buf bytes.Buffer
+	writer := bufio.NewWriter(&buf)
+
+	err := shared.TokenPump{
+		TokenSource: cbor.NewDecoder(cbor.DecodeOptions{}, reader),
+		TokenSink:   pretty.NewEncoder(writer),
+	}.Run()
+
+	if err != nil {
+		return "", err
+	}
+
+	if err = writer.Flush(); err != nil {
+		return "", err
+	}
+
+	return buf.String(), nil
+}