adds vendor directory

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

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

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"fmt"
+	"github.com/mattn/go-gtk/gdk"
+	"github.com/mattn/go-gtk/glib"
+	"github.com/mattn/go-gtk/gtk"
+	"os"
+	"unsafe"
+)
+
+func main() {
+	gtk.Init(&os.Args)
+	window := gtk.NewWindow(gtk.WINDOW_TOPLEVEL)
+	window.SetTitle("GTK Events")
+	window.Connect("destroy", gtk.MainQuit)
+
+	event := make(chan interface{})
+
+	window.Connect("key-press-event", func(ctx *glib.CallbackContext) {
+		arg := ctx.Args(0)
+		event <- *(**gdk.EventKey)(unsafe.Pointer(&arg))
+	})
+	window.Connect("motion-notify-event", func(ctx *glib.CallbackContext) {
+		arg := ctx.Args(0)
+		event <- *(**gdk.EventMotion)(unsafe.Pointer(&arg))
+	})
+
+	go func() {
+		for {
+			e := <-event
+			switch ev := e.(type) {
+			case *gdk.EventKey:
+				fmt.Println("key-press-event:", ev.Keyval)
+				break
+			case *gdk.EventMotion:
+				fmt.Println("motion-notify-event:", int(ev.X), int(ev.Y))
+				break
+			}
+		}
+	}()
+
+	window.SetEvents(int(gdk.POINTER_MOTION_MASK | gdk.POINTER_MOTION_HINT_MASK | gdk.BUTTON_PRESS_MASK))
+	window.SetSizeRequest(400, 400)
+	window.ShowAll()
+
+	gtk.Main()
+}