Add logging framework.

DEBUG messages are completely optimized out if NDEBUG is defined.

src/Log.cpp

@@ -0,0 +1,16 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 2015. All Rights Reserved.                             */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#include "Log.h"
+
+using namespace nt;
+
+ATOMIC_STATIC_INIT(Logger)
+
+Logger::Logger() : m_min_level(100) {}
+
+Logger::~Logger() {}