Make index type of Triplet default to SparseMatrix::Index as suggested by Kolja Brix. Fixes Bug 665.
Make index type of Triplet default to SparseMatrix::Index as suggested by Kolja Brix. Fixes Bug 665.

--HG--
extra : source : 6d0a7ec5f2cd4d628e56293ca2beb9aa6fb461c0

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