Incorporated changes from @masaomi for rb-gsl compatibility.
Incorporated changes from @masaomi for rb-gsl compatibility.

janusnic/nmatrix,wlevine/nmatrix,johnmarinelli/nmatrix,wlevine/nmatrix,thisMagpie/nmatrix,wlevine/nmatrix,thisMagpie/nmatrix,janusnic/nmatrix,thisMagpie/nmatrix,agisga/nmatrix,johnmarinelli/nmatrix,johnmarinelli/nmatrix,thisMagpie/nmatrix,agisga/nmatrix,janusnic/nmatrix,agisga/nmatrix,agisga/nmatrix,johnmarinelli/nmatrix,janusnic/nmatrix,wlevine/nmatrix