Add contrast and backlight settings. Should address issue 17.

Author: nseidle

examples/Example1-HelloWorld/Example1-HelloWorld.ino

@@ -41,6 +41,9 @@ void setup() {
 
   lcd.begin(Wire); //Set up the LCD for I2C communication
 
+  lcd.setBacklight(255, 255, 255); //Set backlight to bright white
+  lcd.setContrast(5); //Set contrast. Lower to 0 for higher contrast.
+
   lcd.clear(); //Clear the display - this moves the cursor to home position as well
   lcd.print("Hello, World!");
 }

examples/Serial/Example1-HelloWorld/Example1-HelloWorld.ino

@@ -40,6 +40,11 @@ void setup() {
   Serial.begin(9600);
 
   lcd.begin(Serial); //Set up the LCD for Serial communication at 9600bps
+
+  lcd.setBacklight(255, 255, 255); //Set backlight to bright white
+  lcd.setContrast(5); //Set contrast. Lower to 0 for higher contrast.
+
+  lcd.clear(); //Clear the display - this moves the cursor to home position as well
   lcd.print("Hello, World!");
 }
 
@@ -50,4 +55,3 @@ void loop() {
   // Print the number of seconds since reset:
   lcd.print(millis() / 1000);
 }
-