First round of modifications for spatiallyvarying viscosity
Errors fixed for stokes
Almost there for the constant case
ConstantViscosity should now be working
MU templating compiles but failing test_stokes_poiseuille_flow
Passed regression tests (apart from a couple related to new libMesh changes and a broken regression)
Merge pull request #163 from vikramvgarg/spatiallyvaryingviscosity

IncompressibleNavierStokesBase Viscosity template parameter