2014-07-07 Version 1.3.1 released

         Bugfix release.

         #484: Require CMAKE 2.8

         #471, #472, #480: Various clang compatibility fixes

         #481, #482: Fix shared lib build and versioning

         #476: Fix invalid map query in NearestNeighborTsp

         #478: Bugfix in debug checking and lower bound handling

               in min cost flow algorithms

         #479, #465: Bugfix in default LP/MIP backend settings

         #476: Bugfix in tsp_test

         #487: Add missing include header and std:: namespace spec.

         #474: Fix division by zero error in NetworkSimplex