Fixed constness in Array- and MatrixWrapper. This also fixes the compilation on VC11.
Fixed constness in Array- and MatrixWrapper.
This also fixes the compilation on VC11.

mjbshaw/Eigen,madlib/eigen_backup,madlib/eigen_backup,rotorliu/eigen,mjbshaw/Eigen,rotorliu/eigen,mjbshaw/Eigen,rotorliu/eigen,rotorliu/eigen,mjbshaw/Eigen,madlib/eigen_backup,madlib/eigen_backup