Merge pull request #472 from tendermint/string_reprs

Add Tx String representation. Got the ok from Anton.

types/tx.go

@@ -3,6 +3,7 @@ package types
 import (
 	"bytes"
 	"errors"
+	"fmt"
 
 	abci "github.com/tendermint/abci/types"
 	"github.com/tendermint/go-wire/data"
@@ -19,6 +20,10 @@ func (tx Tx) Hash() []byte {
 	return merkle.SimpleHashFromBinary(tx)
 }
 
+func (tx Tx) String() string {
+	return fmt.Sprintf("Tx{%X}")
+}
+
 type Txs []Tx
 
 func (txs Txs) Hash() []byte {