[Dune] 1d quadrature

[Oliver Sander]

Hi Sreejith!

I cannot instantiate quadrature rules for 1d elements anymore, because
there seems to be no specialization for the 1d simplex classes.  I am
not actually using them (only 1d cube rules), but they get instantiated
anyways when I use

const QuadratureRule<double, 1>& quad = QuadratureRules<double, 1>::rule(Dune::cube, polOrd);

Could you please fix this?

Thanx,
Oliver

************************************************************************
* Oliver Sander                **                                      *
* Freie Universität Berlin     ** email: sander at math.fu-berlin.de      *
* Institut für Mathematik II   ** phone: + 49 (30) 838 75217           *
* Arnimallee 2-6               ** fax  : + 49 (30) 838 54977           *
* 14195 Berlin, Germany        ** URL  : www.math.fu-berlin.de/~sander *
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