Crash on Win Release mode with math::Map and math::ReplicateOp

[Alzathar]

The line auto g = math::Map<const math::Vector>(1, model->gravity(), &gres).replicate(samples); crashes. A unit test on this issue must be added. The update to Eigen 3.3.1 (see issue #55) might fix the problem. On the other hand, this problem may be related to the map of a const vector. Another unit test should be done but without the constness.