Gurobi update

1. MILP solver output explanation

http://www.gurobi.com/doc/40/refman/node592.html

2. Gurobi-AMPL on NEOS

Gurobi with AMPL interface is now available at http://neos-server.org/neos/solvers/milp:Gurobi/AMPL.html 3. Highlights of Gurobi Optimizer 4.0 http://www.gurobi.com/news/gurobi40.html