Add example for Spark Core - blinking

examples/spark_blink/spark_blink.coffee

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+Cylon = require '../..'
+
+Cylon.robot
+  connection:
+    name: 'spark', adaptor: 'spark', deviceId: '', accessToken: ''
+
+  device:
+    name: 'led', driver: 'led', pin: 'D7'
+
+  work: (my) ->
+    every 1.second(), -> my.led.toggle()
+
+.start()

examples/spark_blink/spark_blink.js

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+var Cylon = require('../..');
+
+Cylon.robot({
+  connection: {
+    name: 'spark',
+    adaptor: 'spark',
+    deviceId: '',
+    accessToken: ''
+  },
+
+  device: {
+    name: 'led',
+    driver: 'led',
+    pin: 'D7'
+  },
+
+  work: function(my) {
+    every(1..second(), function() { my.led.toggle(); });
+  }
+}).start();

examples/spark_blink/spark_blink.litcoffee

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+# Spark - Blink
+
+For this example, we're going to connect to a Spark Core and make the LED on
+pin D7 blink on a 1-second interval. Before we start, make sure you've got the
+`cylon-spark` 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 Spark Core, using the
+previously-mentioned `cylon-spark` module. We'll also have one device, the LED
+on pin D7.
+
+      connection:
+        name: 'spark', adaptor: 'spark', deviceId: '', accessToken: ''
+
+      device:
+        name: 'led', driver: 'led', pin: 'D7'
+
+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()