Adding servo driver example.

examples/servo.coffee

@@ -0,0 +1,20 @@
+Cylon = require('..')
+
+# Initialize the robot
+Cylon.robot
+  connection:
+    name: 'arduino', adaptor: 'firmata', port: '/dev/ttyACM0'
+
+  device:
+    name: 'servo', driver: 'servo', pin: 3
+
+  work: (my) ->
+    angle = 0
+    increment = 90
+    every 1.seconds(), ->
+      angle += increment
+      my.servo.angle(angle)
+      console.log("Current Angle => #{ my.servo.currentAngle() }")
+      increment = -increment if (angle is 0) or (angle is 180)
+
+.start()