Add Cylon.repl and Robot#repl methods

Each invokes a Repl with some necessary context

lib/cylon.js

@@ -13,6 +13,7 @@ var Async = require("async");
 var Logger = require("./logger"),
     Robot = require("./robot"),
     Config = require("./config"),
+    Repl = require("./repl"),
     Utils = require("./utils"),
     _ = require("./utils/helpers");
 
@@ -143,6 +144,20 @@ Cylon.config = function(opts) {
   return Config;
 };
 
+/**
+ * Starts a new REPL in the context of the MCP.
+ *
+ * @return {void}
+ */
+Cylon.repl = function repl() {
+  var repl = new Repl(
+    { prompt: "mcp > " },
+    { robots: this.robots }
+  );
+
+  repl.start();
+}
+
 // Public: Halts the API and the robots
 //
 // callback - callback to be triggered when Cylon is ready to shutdown

lib/robot.js

@@ -11,6 +11,7 @@
 var initializer = require("./initializer"),
     Logger = require("./logger"),
     Utils = require("./utils"),
+    Repl = require("./repl"),
     Config = require("./config"),
     _ = require("./utils/helpers");
 
@@ -421,6 +422,22 @@ Robot.prototype.halt = function(callback) {
   this.running = false;
 };
 
+/**
+ * Starts a new REPL in the context of the Robot.
+ *
+ * @return {void}
+ */
+Robot.prototype.repl = function() {
+  var context = {};
+
+  _.extend(context, this.connections);
+  _.extend(context, this.devices);
+
+  var repl = new Repl({ prompt: this.name + " > " }, context);
+
+  repl.start();
+};
+
 // Public: Returns basic info about the robot as a String
 //
 // Returns a String