Literate CoffeeScript version of raspi_blink example

examples/raspi_blink/raspi_blink.litcoffee

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+# Raspberry Pi - Blink
+
+For this example, we're going to connect to a Raspberry Pi and make the LED on
+pin 11 blink on a 1-second interval. Before we start, make sure you've got the
+`cylon-raspi` module installed.
+
+First, let's make sure to load the Cylon module:
+
+    Cylon = require '../..'
+
+After we've got that done, we can start defining our robot:
+
+    Cylon.robot
+
+We'll have a singular connection to a Raspberry Pi, using the
+previously-mentioned `cylon-raspi` module. We'll also have one device, the LED
+on pin 11.
+
+      connection: { name: 'raspi', adaptor: 'raspi' }
+      device: { name: 'led', driver: 'led', pin: 11 }
+
+Those are all the components for our robot, so next we'll define the work. All
+we're going to do for this example is tell the LED to toggle every second.
+
+      work: (my) ->
+        every 1.second(), -> my.led.toggle()
+
+And with all those pieces in place, we can tell the robot to get started:
+
+    .start()