Adding stuff needed for interaction integral postprocessor #3056
Merge pull request #3057 from backmari/crack_front_3056

Adding stuff in CrackFrontDefinition that is needed for interaction integral postprocessor #3056
Merge commit '359a725ffef68bcaa569fbaeae9f11b0045dfd89'
fixup examples to work without comm world closes #3055
Merge pull request #3059 from friedmud/examples_3055

fixup examples to work without comm world
Merge commit '95c7d8820c2751951ff283c51fee161a8f24a878'