Literate CoffeeScript version of pure_gpio example

examples/pure_gpio/pure_gpio.litcoffee

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+# Pure GPIO
+
+Here we'll demonstrate an example of controlling a digital pin using a pure GPIO
+interface.
+
+First, we need to require the `digital-pin` class inside of Cylon:
+
+    require '../../dist/digital-pin'
+
+Then we'll instantiate a new instance of it, with write permissions and using
+pin 4.
+
+    pin4 = new Cylon.IO.DigitalPin(pin: 4, mode: 'w')
+
+Once the pin's been opened, we'll write to the console to indicate so:
+
+    pin4.on 'open', (data) ->
+      console.log "Pin files have been created"
+
+And on the 'digitalWrite' event for the pin, we'll log the value that's been
+written:
+
+    pin4.on 'digitalWrite', (value) ->
+      console.log "Value written to pin: #{value}"
+
+When the pin's been connected, we'll set it to high (1)
+
+    pin4.on 'connect', (data) ->
+      console.log "Pin mode has been setup!"
+      pin4.setHigh()
+
+And with all our events defined, we'll connect the pin:
+
+    pin4.connect()