2014-07-07 Version 1.3.1 released

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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