Switch to github.com/golang/dep for vendoring

Signed-off-by: Mrunal Patel <mrunalp@gmail.com>

vendor/github.com/gogo/protobuf/proto/pointer_unsafe_gogo.go

@@ -1,5 +1,7 @@
-// Copyright (c) 2013, Vastech SA (PTY) LTD. All rights reserved.
-// http://github.com/gogo/protobuf/gogoproto
+// Protocol Buffers for Go with Gadgets
+//
+// Copyright (c) 2013, The GoGo Authors. All rights reserved.
+// http://github.com/gogo/protobuf
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
@@ -70,16 +72,13 @@ func structPointer_Copy(oldptr structPointer, newptr structPointer, size int) {
 
 func appendStructPointer(base structPointer, f field, typ reflect.Type) structPointer {
 	size := typ.Elem().Size()
-	oldHeader := structPointer_GetSliceHeader(base, f)
-	newLen := oldHeader.Len + 1
-	slice := reflect.MakeSlice(typ, newLen, newLen)
-	bas := toStructPointer(slice)
-	for i := 0; i < oldHeader.Len; i++ {
-		newElemptr := uintptr(bas) + uintptr(i)*size
-		oldElemptr := oldHeader.Data + uintptr(i)*size
-		copyUintPtr(oldElemptr, newElemptr, int(size))
-	}
 
+	oldHeader := structPointer_GetSliceHeader(base, f)
+	oldSlice := reflect.NewAt(typ, unsafe.Pointer(oldHeader)).Elem()
+	newLen := oldHeader.Len + 1
+	newSlice := reflect.MakeSlice(typ, newLen, newLen)
+	reflect.Copy(newSlice, oldSlice)
+	bas := toStructPointer(newSlice)
 	oldHeader.Data = uintptr(bas)
 	oldHeader.Len = newLen
 	oldHeader.Cap = newLen