adds vendor directory

vendors dependencies in standard `vendor` directory, managed by glide

vendor/github.com/mattn/go-gtk/example/thread/thread.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"runtime"
+	"strconv"
+	"time"
+
+	"github.com/mattn/go-gtk/gdk"
+	"github.com/mattn/go-gtk/glib"
+	"github.com/mattn/go-gtk/gtk"
+)
+
+func main() {
+	runtime.GOMAXPROCS(10)
+	glib.ThreadInit(nil)
+	gdk.ThreadsInit()
+	gdk.ThreadsEnter()
+	gtk.Init(nil)
+	window := gtk.NewWindow(gtk.WINDOW_TOPLEVEL)
+	window.Connect("destroy", gtk.MainQuit)
+
+	vbox := gtk.NewVBox(false, 1)
+
+	label1 := gtk.NewLabel("")
+	vbox.Add(label1)
+	label2 := gtk.NewLabel("")
+	vbox.Add(label2)
+
+	window.Add(vbox)
+
+	window.SetSizeRequest(100, 100)
+	window.ShowAll()
+	time.Sleep(1000 * 1000 * 100)
+	go (func() {
+		for i := 0; i < 300000; i++ {
+			gdk.ThreadsEnter()
+			label1.SetLabel(strconv.Itoa(i))
+			gdk.ThreadsLeave()
+		}
+		gtk.MainQuit()
+	})()
+	go (func() {
+		for i := 300000; i >= 0; i-- {
+			gdk.ThreadsEnter()
+			label2.SetLabel(strconv.Itoa(i))
+			gdk.ThreadsLeave()
+		}
+		gtk.MainQuit()
+	})()
+	gtk.Main()
+}