Minor fix to rake spec
Minor fix to rake spec

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