message: doc: Switch boost::thread to std::thread in scheduler
  After commit the scheduler itself no longer cares if the
  serviceQueue is run in a std::thread or boost::thread. Change the
  documentation to std::thread because we switched to C++11.
diff: #ifndef BITCOIN_SCHEDULER_H
  #define BITCOIN_SCHEDULER_H
  -//
  -// NOTE:
  -// boost::thread should be ported to std::thread
  -// when we support C++11.
  -//
  #include <condition_variable>
  #include <functional>
  #include <list>
  // CScheduler* s = new CScheduler();
  // s->scheduleFromNow(doSomething, std::chrono::milliseconds{11}); // Assuming a: void doSomething() { }
  // s->scheduleFromNow([=] { this->func(argument); }, std::chrono::milliseconds{3});
  -// boost::thread* t = new boost::thread(std::bind(CScheduler::serviceQueue, s));
  +// std::thread* t = new std::thread([&] { s->serviceQueue(); });
  //
  // ... then at program shutdown, make sure to call stop() to clean up the thread(s) running serviceQueue:
  // s->stop();
  