Node improvements (#47)

* block partial persist

* replaced refactored files with old one.

* removed gokit/log from deps

* Tweaks to not overburden remote nodes with getheaders/getblocks

* Changed Transporter interface to not take the server as argument due to a cause of race warning from the compiler

* started server test suite

* more test + return errors from message handlers

* removed --race from build

* Little improvements.

pkg/network/message_test.go

@@ -1,61 +1 @@
 package network
-
-import (
-	"bytes"
-	"testing"
-
-	"github.com/CityOfZion/neo-go/pkg/network/payload"
-	"github.com/stretchr/testify/assert"
-)
-
-func TestMessageEncodeDecode(t *testing.T) {
-	m := NewMessage(ModeTestNet, CMDVersion, nil)
-
-	buf := &bytes.Buffer{}
-	if err := m.encode(buf); err != nil {
-		t.Error(err)
-	}
-	assert.Equal(t, len(buf.Bytes()), minMessageSize)
-
-	md := &Message{}
-	if err := md.decode(buf); err != nil {
-		t.Error(err)
-	}
-	assert.Equal(t, m, md)
-}
-
-func TestMessageEncodeDecodeWithVersion(t *testing.T) {
-	var (
-		p = payload.NewVersion(12227, 2000, "/neo:2.6.0/", 0, true)
-		m = NewMessage(ModeTestNet, CMDVersion, p)
-	)
-
-	buf := new(bytes.Buffer)
-	if err := m.encode(buf); err != nil {
-		t.Error(err)
-	}
-
-	mDecode := &Message{}
-	if err := mDecode.decode(buf); err != nil {
-		t.Fatal(err)
-	}
-	assert.Equal(t, m, mDecode)
-}
-
-func TestMessageInvalidChecksum(t *testing.T) {
-	var (
-		p = payload.NewVersion(1111, 3000, "/NEO:2.6.0/", 0, true)
-		m = NewMessage(ModeTestNet, CMDVersion, p)
-	)
-	m.Checksum = 1337
-
-	buf := new(bytes.Buffer)
-	if err := m.encode(buf); err != nil {
-		t.Error(err)
-	}
-
-	md := &Message{}
-	if err := md.decode(buf); err == nil && err != errChecksumMismatch {
-		t.Fatalf("decode should fail with %s", errChecksumMismatch)
-	}
-}