Added C++ base components and example

extras/timer/component.mk

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+# Component makefile for extras/timer
+
+INC_DIRS += $(ROOT)extras

extras/timer/countdown.hpp

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+/* 
+ * ESP8266 FreeRTOS Firmware
+ * Copyright (C) 2015  Michael Jacobsen
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ * 
+ * https://github.com/SuperHouse/esp-open-rtos
+ * 
+ */
+
+#ifndef COM_THOLUSI_ESP_OPEN_RTOS_TIMER_HPP
+#define	COM_THOLUSI_ESP_OPEN_RTOS_TIMER_HPP
+
+#include "FreeRTOS.h"
+#include "task.h"
+
+namespace esp_open_rtos {
+namespace timer {
+
+#define __millis()  (xTaskGetTickCount() * portTICK_RATE_MS)
+
+/******************************************************************************************************************
+ * countdown_t
+ *
+ */
+class countdown_t
+{
+public:
+    /**
+     * 
+     */
+    countdown_t()
+    {  
+	interval_end_ms = 0L;
+    }
+    /**
+     * 
+     * @param ms
+     */
+    countdown_t(int ms)
+    {
+        countdown_ms(ms);   
+    }
+    /**
+     * 
+     * @return 
+     */
+    bool expired()
+    {
+        return (interval_end_ms > 0L) && (__millis() >= interval_end_ms);
+    }
+    /**
+     * 
+     * @param ms
+     */
+    void countdown_ms(unsigned long ms)  
+    {
+        interval_end_ms = __millis() + ms;
+    }
+    /**
+     * 
+     * @param seconds
+     */
+    void countdown(int seconds)
+    {
+        countdown_ms((unsigned long)seconds * 1000L);
+    }
+    /**
+     * 
+     * @return 
+     */
+    int left_ms()
+    {
+        return interval_end_ms - __millis();
+    }
+    
+private:
+    portTickType interval_end_ms;
+};
+
+} // namespace timer {
+} // namespace esp_open_rtos {
+
+#endif