Close #45

Added _BV macro to LCD.h, this macro is normally defined by Atmel in its library. The macro is very dependent from Atmel.

REMARK: This fix will not fix being able to compile this library as the Arduino IDE has broken a range of base support operation on the DUE. For example: digitalPinToTimer()

This library has not even been ported nor tested with Arduino 1.5

LCD.h

@@ -51,6 +51,20 @@
 #include <Print.h>
 
 
+/*!
+ @defined 
+ @abstract   Performs a bitwise shift.
+ @discussion Defines _BV bit shift which is very dependent macro defined by
+ Atmel.
+
+    \note The bit shift is performed by the compiler which then inserts the
+    result into the code. Thus, there is no run-time overhead when using
+    _BV().
+*/
+#ifndef _BV    
+#define _BV(bit) (1 << (bit))
+#endif
+
 /*!
  @defined 
  @abstract   Enables disables fast waits for write operations for LCD