Added a karotz instance to maintain state.

Updated APIs to check if karotz is sleeping.

karotz.js

@@ -0,0 +1,66 @@
+/*!
+ * OpenKarotz Emulator
+ *
+ * Copyright (c) 2013 Olivier Bagot (http://github.com/hobbe/openkarotz-emulator)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * http://opensource.org/licenses/MIT
+ *
+ */
+
+'use strict';
+
+var log = require('./log');
+
+var sleeping = true;
+var sleepTime = new Date().getTime();
+var earsDisabled = false;
+
+exports.isSleeping = function() {
+	return sleeping;
+};
+
+exports.getSleepTime = function() {
+	return sleepTime;
+};
+
+exports.isEarsDisabled = function() {
+	return earsDisabled;
+};
+
+function sleep() {
+	sleeping = true;
+	sleepTime = new Date().getTime();
+	return sleeping;
+};
+exports.sleep = sleep;
+
+function wakeup() {
+	sleeping = false;
+	sleepTime = 0;
+	return sleeping;
+};
+exports.wakeup = wakeup;
+
+function reboot() {
+	wakeup();
+	return sleeping;
+};
+exports.reboot = reboot;