2.7.1 (unstable):

* signal: Add a moving connect() method, taking an rvalue reference
  to a slot.
  (Kjell Ahlstedt) Bug #756484
* can_deduce_result_type_with_decltype: Rename the check() methods to
  checksize(). check() is a preprocessor macro in Mac OS X.
  (Kjell Ahlstedt) Bug #759315 (David Otto)
* Temporarily undefine the nil macro, if it's defined.
  nil is a preprocessor macro in Objective-C++ and Mac OS X.
  (Kjell Ahlstedt) Bug #695235
* Correct the mem_functor<> declarations.
  Murray Cumming