DOC: add explicit pointer to scikits.umfpack github page
DOC: add explicit pointer to scikits.umfpack github page

scikit-umfpack/scikit-umfpack,rc/scikit-umfpack-rc,rc/scikit-umfpack,rc/scikit-umfpack-rc,timtadh/scikit-umfpack,scikit-umfpack/scikit-umfpack,timtadh/scikit-umfpack,rc/scikit-umfpack