Added NodalVariableValue assert (closes #2849)
Merge pull request #2852 from aeslaughter/nodal-2849

Added NodalVariableValue assert
Real value optional coupling - closes #2435
Merge pull request #2851 from permcody/default_couple_2435

Real value optional coupling
Should close issue #2854 .  I have added a multiplying function to RichardsPiecewiseLinearSinkFlux.  Amended: got rid of feproblem - all Side postprocessors have _dt already.
Merge pull request #2860 from WilkAndy/feature_2854

Should close issue #2854 .  I have added a multiplying function to Richa...