improvements on the eigen executioners #2862
fix NonlinearEigen, this ci needs a regold #2862
a new nonlinear eigenvalue test #2862
another eigen test with a coupled system #2862
Merge pull request #2863 from YaqiWang/eigen_fix_2862

This PR fixed few things in the eigen executioners and add two new tests
Removed some output items (closes #2883)
Merge pull request #2884 from aeslaughter/peacock

Removed some output items
eigen kernels may not cover all eigen variables, so provide a function to mark a eigen variable #2888
fix a bug in the scaling which requres regolding #2888
make AddVariableAction able to add an eigen variable and create a test with deficient B #2888
Merge pull request #2889 from YaqiWang/eigen_var_2888

Eigen variable add 2888
Merge pull request #2882 from permcody/yaml_dump_default

Printing default coupling value in --dump and --yaml
Replace addPostprocessor(std::string, Real, ...) with addParam<PostprocessorName>(std::string, Real, ...)
refs #2879