Add regression test for bugs 854 and 1014, and check that the eigenvector matrix is unitary.
Add regression test for bugs 854 and 1014, and check that the eigenvector matrix is unitary.

madlib/eigen_backup,rotorliu/eigen,madlib/eigen_backup,madlib/eigen_backup,madlib/eigen_backup,rotorliu/eigen,rotorliu/eigen,rotorliu/eigen