[libsigc++2] Created tag 2.6.0

[Murray Cumming <murrayc src gnome org>]

The unsigned tag '2.6.0' was created.

Tagger: Murray Cumming <murrayc murrayc com>
Date: Mon Sep 21 21:16:11 2015 +0200

    2.6.0

Changes since the last tag '2.5.4':

Chun-wei Fan (3):
      sigc++config.h.in: Allow Build for MSVC 2013
      Update README on Visual Studio Builds
      MSVC Builds: Add "Install" Project

Kjell Ahlstedt (2):
      Update .gitignore
      Update source of web page

Marcin Kolny (1):
      C++11: deduce_result_type: build fix, using SFINAE paradigm.

Murray Cumming (3):
      C++11: deduce_result_type: Simplify with variadic template and std::conditional<>.
      C++11: deduce_result_type: Simpifying, removing use of std::is_same().
      2.6.0