Nonzero initial stress components may be specified as functions in TensorMechanicsMaterial

Fixes #3763

I initially wanted to specify the components as AuxVariables, but
i couldn't get it to work because the AuxVars weren't defined at
the point of calling initQpStatefulProperties.  Functions will do
for me for the present, but if anyone better at moose would like
to change to AuxVariables, i'd be quite happy!
Merge pull request #3772 from WilkAndy/insitu_stress_3763

Nonzero initial stress components may be specified as functions in Tenso...
FiniteStrainPlasticBase can now apply strain increment in small substeps

Fixes #3774

It would be even better if FiniteStrainPlasticBase could
signal that it failed, even after applying all these small
substeps, and hence cut the timestep for the entire
mesh.  I'm not sure how to do that, and it wasn't the
point of this issue.
Fixing tests originally committed as part of issue #3742
Merge pull request #3773 from gambka/contact_tests_3742

Fixing tests originally committed as part of issue #3742
Added --error flag for running tests with warnings as errors
Added 'allow_warning' option in RunApp to ignore --error
Added 'allow_warning=true' to tests that should be producing warnings
Removed commas from MooseEnum
Removed warning of unused recover data on restart (refs #3759)
Removed warning with auto material output and CoupledPropblem by supporting auto material output in CoupledProblem (refs #3759)
Removed file conflicts in VTK test for --recover
Moved location of sub-apps away from element boundary (refs #3743)
Merge pull request #3778 from aeslaughter/transfers-3743

Moved location of sub-apps away from element boundary
Removing Residual Postprocessor from RK2 test

Refs #3769.
Making it plural (refs #3759)
Merge pull request #3781 from jwpeterson/rk2

Removing Residual Postprocessor from RK2 test
Merge pull request #3771 from aeslaughter/unused-recover-3759

MOOSE is warning free
Add MultiMooseEnum to MOOSE
refs #3688
Merge pull request #3770 from permcody/VectorMooseEnum

Add MultiMooseEnum to MOOSE