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/UTouch/UTouch.h

@@ -0,0 +1,80 @@
+/*
+  UTouch.h - Arduino/chipKit library support for Color TFT LCD Touch screens 
+  Copyright (C)2010-2014 Henning Karlsen. All right reserved
+  
+  Basic functionality of this library are based on the demo-code provided by
+  ITead studio. You can find the latest version of the library at
+  http://www.henningkarlsen.com/electronics
+
+  If you make any modifications or improvements to the code, I would appreciate
+  that you share the code with me so that I might include it in the next release.
+  I can be contacted through http://www.henningkarlsen.com/electronics/contact.php
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the CC BY-NC-SA 3.0 license.
+  Please see the included documents for further information.
+
+  Commercial use of this library requires you to buy a license that
+  will allow commercial use. This includes using the library,
+  modified or not, as a tool to sell products.
+
+  The license applies to all part of the library including the 
+  examples and tools supplied with the library.
+*/
+
+#ifndef UTouch_h
+#define UTouch_h
+
+#define UTOUCH_VERSION	124
+
+#if defined(__AVR__)
+	#include "Arduino.h"
+	#include "hardware/avr/HW_AVR_defines.h"
+#elif defined(__PIC32MX__)
+	#include "WProgram.h"
+	#include "hardware/pic32/HW_PIC32_defines.h"
+#elif defined(__arm__)
+	#include "Arduino.h"
+	#include "hardware/arm/HW_ARM_defines.h"
+#endif
+
+#define PORTRAIT			0
+#define LANDSCAPE			1
+
+#define PREC_LOW			1
+#define PREC_MEDIUM			2
+#define PREC_HI				3
+#define PREC_EXTREME		4
+
+class UTouch
+{
+	public:
+		int16_t	TP_X ,TP_Y;
+
+				UTouch(byte tclk, byte tcs, byte tdin, byte dout, byte irq);
+
+		void	InitTouch(byte orientation = LANDSCAPE);
+		void	read();
+		bool	dataAvailable();
+		int16_t	getX();
+		int16_t	getY();
+		void	setPrecision(byte precision);
+
+		void	calibrateRead();
+    
+    private:
+		regtype *P_CLK, *P_CS, *P_DIN, *P_DOUT, *P_IRQ;
+		regsize B_CLK, B_CS, B_DIN, B_DOUT, B_IRQ;
+		byte	T_CLK, T_CS, T_DIN, T_DOUT, T_IRQ;
+		long	_default_orientation;
+		byte	orient;
+		byte	prec;
+		byte	display_model;
+		long	disp_x_size, disp_y_size, default_orientation;
+		long	touch_x_left, touch_x_right, touch_y_top, touch_y_bottom;
+
+		void	touch_WriteData(byte data);
+		word	touch_ReadData();
+};
+
+#endif