message: Removed unneeded opencv include
  and added Eigen/Core include.
diff: #include "eos/morphablemodel/MorphableModel.hpp"
  -#include "Eigen/QR" // and Core for Vector2f
  -
  -#include "opencv2/core/core.hpp" // Remove eventually? Seems just for affine_camera_matrix now.
  +#include "Eigen/Core"
  +#include "Eigen/QR"
  #include "boost/optional.hpp"
  