core: add block test from dev branch

And drop it from _pkg.dev. Adapted for master.

_pkg.dev/wire/payload/block.go

@@ -1,67 +0,0 @@
-package payload
-
-import (
-	"bufio"
-	"bytes"
-	"io"
-
-	"github.com/CityOfZion/neo-go/pkg/wire/payload/transaction"
-	"github.com/CityOfZion/neo-go/pkg/wire/util"
-)
-
-// Block representa a Block in the neo-network
-type Block struct {
-	BlockBase
-	Txs []transaction.Transactioner
-}
-
-// Decode decodes an io.Reader into a Block
-func (b *Block) Decode(r io.Reader) error {
-	br := &util.BinReader{R: r}
-	b.DecodePayload(br)
-	return br.Err
-}
-
-// Encode writes a block into a io.Writer
-func (b *Block) Encode(w io.Writer) error {
-	bw := &util.BinWriter{W: w}
-	b.EncodePayload(bw)
-	return bw.Err
-}
-
-//EncodePayload implements Messager interface
-func (b *Block) EncodePayload(bw *util.BinWriter) {
-	b.BlockBase.EncodePayload(bw)
-	bw.VarUint(uint64(len(b.Txs)))
-	for _, tx := range b.Txs {
-		tx.Encode(bw.W)
-	}
-}
-
-// DecodePayload implements Messager interface
-func (b *Block) DecodePayload(br *util.BinReader) error {
-
-	b.BlockBase.DecodePayload(br)
-	lenTXs := br.VarUint()
-
-	b.Txs = make([]transaction.Transactioner, lenTXs)
-
-	reader := bufio.NewReader(br.R)
-	for i := 0; i < int(lenTXs); i++ {
-
-		tx, err := transaction.FromReader(reader)
-		if err != nil {
-			return err
-		}
-		b.Txs[i] = tx
-
-	}
-	return nil
-}
-
-// Bytes returns the Byte representation of Block
-func (b *Block) Bytes() ([]byte, error) {
-	buf := new(bytes.Buffer)
-	err := b.Encode(buf)
-	return buf.Bytes(), err
-}