Update Print Function to Accept io.Writer and not use os.StdOut by de…

…fault (#24)

* Updated print function

* Address PR comments

ber.go

@@ -160,6 +160,10 @@ func PrintBytes(out io.Writer, buf []byte, indent string) {
 	}
 }
 
+func WritePacket(out io.Writer, p *Packet) {
+	printPacket(out, p, 0, false)
+}
+
 func PrintPacket(p *Packet) {
 	printPacket(os.Stdout, p, 0, false)
 }