Add new scene controller with touch display example.

Upgraded RF24 to latest version which supports SoftSPI. 
Added DigitalIO and UTFT libraries to support the new example.
Fix problem reported in RelayWithButtonActuator example.

libraries/DigitalIO/DigitalIO.h

@@ -0,0 +1,36 @@
+/* Arduino DigitalIO Library
+ * Copyright (C) 2013 by William Greiman
+ *
+ * This file is part of the Arduino DigitalIO Library
+ *
+ * This Library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This Library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Arduino DigitalIO Library.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+/**
+ * @file
+ * @brief Fast Digital I/O functions
+ *
+ */
+#ifndef DigitalIO_h
+#define DigitalIO_h 1
+//------------------------------------------------------------------------------
+/** DigitalPin version YYYYMMDD */
+#define DIGITAL_IO_VERSION 20140217
+//------------------------------------------------------------------------------
+#include <DigitalPin.h>
+#include <I2cConstants.h>
+#include <PinIO.h>
+#include <SoftI2cMaster.h>
+#include <SoftSPI.h>
+#endif // DigitalIO_h