Added Visual Studio 2012 debug visualizers.
Added Visual Studio 2012 debug visualizers.

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