2015-11-30  Murray Cumming  <murrayc@murrayc.com>

	3.19.3

2015-11-30  Murray Cumming  <murrayc@murrayc.com>

	Require the latest gtkmm and glibmm.

2015-11-26  Murray Cumming  <murrayc@murrayc.com>

	Add an override keyword

2015-11-26  Murray Cumming  <murrayc@murrayc.com>

	Multi-threaded chapter: Remove warnings about sigc::slots and Glib::Threads::Thread.

	Because people would use regular lambdas or std::function functors with
	std::thread in C++11.

	Also, change the mention of Glib::Thread::Mutex to std::mutex.

	Bug #755091

2015-11-26  Murray Cumming  <murrayc@murrayc.com>

	multithread example: Use std::thread, etc, instead of Glib::Threads::*.

	Because C++11 now has this concurrency API and we should use standard
	C++ where possible. We cannot actually deprecate Glib::Threads until
	a future (soon) gtkmm when we can depend on C++14:
	https://mail.gnome.org/archives/gtkmm-list/2015-August/msg00070.html
	Bug #755091