Use Eigen 3.3.4 in Travis builds
Use Eigen 3.3.4 in Travis builds

Milad-Rakhsha/chrono,Milad-Rakhsha/chrono,projectchrono/chrono,rserban/chrono,dariomangoni/chrono,rserban/chrono,projectchrono/chrono,rserban/chrono,projectchrono/chrono,projectchrono/chrono,Milad-Rakhsha/chrono,dariomangoni/chrono,rserban/chrono,dariomangoni/chrono,rserban/chrono,projectchrono/chrono,Milad-Rakhsha/chrono,projectchrono/chrono,dariomangoni/chrono,rserban/chrono,Milad-Rakhsha/chrono,dariomangoni/chrono,rserban/chrono,dariomangoni/chrono,Milad-Rakhsha/chrono