Update go dep (#1560)

This fix updates go dep with `dep ensure --update` as well as the following:
- Removed github.com/ugorji/go restriction in Gopkg.toml (fixes  #1557)
- Added github.com/flynn/go-shlex in Makefile (neede by Caddy, maybe removed later)

This fix fixes #1557

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

vendor/github.com/farsightsec/golang-framestream/Encoder.go

@@ -68,7 +68,7 @@ func NewEncoder(w io.Writer, opt *EncoderOptions) (enc *Encoder, err error) {
 	// Write the start control frame.
 	start := ControlStart
 	start.SetContentType(opt.ContentType)
-	err = start.Encode(enc.writer)
+	err = start.EncodeFlush(enc.writer)
 	if err != nil {
 		return
 	}

vendor/github.com/farsightsec/golang-framestream/framestream_test.go

@@ -3,7 +3,9 @@ package framestream_test
 import (
 	"bytes"
 	"net"
+	"sync"
 	"testing"
+	"time"
 
 	framestream "github.com/farsightsec/golang-framestream"
 )
@@ -132,3 +134,52 @@ func TestOversizeFrame(t *testing.T) {
 		t.Error("data frame too large, received %v", err)
 	}
 }
+
+func testNew(t *testing.T, bidirectional bool) {
+	client, server := net.Pipe()
+	wg := &sync.WaitGroup{}
+	wg.Add(2)
+	done := make(chan bool)
+
+	go func() {
+		_, err := framestream.NewDecoder(server,
+			&framestream.DecoderOptions{
+				Bidirectional: bidirectional,
+			})
+
+		if err != nil {
+			t.Fatal(err)
+		}
+		wg.Done()
+	}()
+
+	go func() {
+		_, err := framestream.NewEncoder(client,
+			&framestream.EncoderOptions{
+				Bidirectional: bidirectional,
+			})
+		if err != nil {
+			t.Fatal(err)
+		}
+		wg.Done()
+	}()
+
+	go func() {
+		wg.Wait()
+		close(done)
+	}()
+
+	select {
+	case <-done:
+	case <-time.After(1 * time.Second):
+		t.Fatal("Time's up.")
+	}
+}
+
+func TestNewBidirectional(t *testing.T) {
+	testNew(t, true)
+}
+
+func TestNewUnidirectional(t *testing.T) {
+	testNew(t, false)
+}