adds vendor directory

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

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

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/mattn/go-gtk/glib"
+)
+
+func main() {
+	glib.IdleAdd(func() bool {
+		fmt.Println("start")
+		return false
+	})
+	glib.TimeoutAdd(1000, func() bool {
+		fmt.Println(fmt.Sprintf("%v", time.Now()))
+		return true
+	})
+
+	glib.NewMainLoop(nil, false).Run()
+}