[dune-pdelab] [Patch] Assembler for l2 volume functionals

[Oliver Sander]

Dear pdelab,
please find attached a patch that implements a new local operator called L2VolumeFunctional.
This new operator simply implements

b_ = \int_\Omega f \theta_i dx

for given functions f and basis vectors \theta_i.  Variations of such a functional
appear as source terms in many local operators, e.g., poisson.hh and linearelasticity.hh.
Some code can therefore be saved by focussing on a single implementation.   Also, for
certain nonlinear energy minimization problems such l2 functionals appear without
a corresponding matrix or differential operator.

Pushing this patch to git master would be much appreciated.

Thanks,
Oliver
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