fix comment
initial file infrastructure for supporting Eigen sparse linear solvers
working vector implementation
working vector implementation
intiial vector, partial implemenation
EigenSparseVector initial implementation
EigenSparseMatrix initial implementation
forgot to remove a libmesh_not_implemented()
hackery to avoid MatType collision
initial linear solver support
fix for --enable-complex
Merge pull request #50 from benkirk/eigen_solver_package

Initial implementation for #44
leave laspack ahead of eigen until the latter implementation is more complete
simpler fix for MatType debacle (#44)