Literate CoffeeScript version of drone_nav example

examples/drone_nav/drone_nav.litcoffee

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+# Drone Navigation
+
+For this Cylon example, we'll be using an ARDrone again, this time getting data
+from it's navigation board. When the board emits an 'update' event, we'll log
+the data it's collected to the console.
+
+Before we get started, make sure you've got the `cylon-ardrone` module
+installed. First, let's start by loading up Cylon:
+
+    Cylon = require '../..'
+
+After we've got that loaded up, let's start defining our robot.
+
+    Cylon.robot
+
+Our robot will, as with the basic ARDrone example, have a connection to an
+ARDrone over an IP address, and a `drone` device to control the drone itself.
+Except this time, we're also adding a `nav` device that will bind to the
+ARDrone's navigation board.
+
+      connection:
+        name: 'ardrone', adaptor: 'ardrone', port: '192.168.1.1'
+
+      devices: [
+        { name: 'drone', driver: 'ardrone' },
+        { name: 'nav', driver: 'ardroneNav' }
+      ]
+
+For our robot's work, it's going to enable the nav board's demo mode in the
+drone's config, and log data to the console whenever the nav board emits the
+'update' event.
+
+      work: (my) ->
+        my.drone.config 'general:navdata_demo', 'TRUE'
+        my.nav.on 'update', (data) -> Logger.info data
+
+Simple enough. Now all that's left is to start the robot:
+
+    .start()