LED: Add draw examples for 8x8 Matrix, add LED characters file.

eg/led-chars-demo.js

@@ -0,0 +1,24 @@
+var five = require("../lib/johnny-five");
+
+var board = new five.Board();
+
+board.on("ready", function() {
+
+  var matrix = new five.Led.Matrix({
+    pins: {
+      data: 2,
+      clock: 3,
+      cs: 4
+    }
+  });
+
+  matrix.on();
+
+  // type `draw("shape_name")` into the repl to see the shape!  
+  this.repl.inject({
+    matrix: matrix,
+    draw: function(shape) {
+      matrix.draw(five.Led.Matrix.CHARS[shape]);
+    }
+  });
+});

eg/led-enumeratechars.js

@@ -0,0 +1,35 @@
+var five = require("../lib/johnny-five");
+
+var board = new five.Board();
+
+board.on("ready", function() {
+
+  var matrix = new five.Led.Matrix({
+    pins: {
+      data: 2,
+      clock: 3,
+      cs: 4
+    }
+  });
+
+  matrix.on();
+
+  var shapes = Object.keys(five.Led.Matrix.CHARS);
+
+  var enumerate = function() {
+    var i = 0;
+    board.loop(500, function() {
+      if (i < shapes.length) {
+        matrix.draw(five.Led.Matrix.CHARS[shapes[i]]);
+        i++;
+      }
+    });
+  };
+
+  enumerate();
+
+  this.repl.inject({
+    matrix: matrix,
+    enumerate: enumerate
+  });
+});