Changed Tx serialization to return bytes instead of a string

serialization.go

@@ -28,6 +28,10 @@ func NumToVarInt(x int) string {
 func RlpEncode(object interface{}) string {
   if str, ok := object.(string); ok {
     return "\x00" + NumToVarInt(len(str)) + str
+  } else if num, ok := object.(uint32); ok {
+    return RlpEncode(Uitoa(num))
+  } else if byt, ok := object.([]byte); ok {
+    return RlpEncode(string(byt))
   } else if slice, ok := object.([]interface{}); ok {
     var buffer bytes.Buffer
     for _, val := range slice {
@@ -53,7 +57,7 @@ func RlpEncode(object interface{}) string {
 }
 
 type RlpSerializer interface {
-  MarshalRls() []byte
-  UnmarshalRls([]byte)
+  MarshalRlp() []byte
+  UnmarshalRlp([]byte)
 }