2015-11-30  Murray Cumming  <[email protected]>

       3.19.3

2015-11-30  Murray Cumming  <[email protected]>

       Require the latest gtkmm and glibmm.

2015-11-26  Murray Cumming  <[email protected]>

       Add an override keyword

2015-11-26  Murray Cumming  <[email protected]>

       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  <[email protected]>

       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