Create CrackDataSampler closes #4377

This is a new VectorPostprocessor that outputs fracture domain integrals for points
along a crack front, with their angular positions used for the "id" field.
Merge pull request #4408 from bwspenc/jint_vpost

Create CrackDataSampler
Adding --check-input command line option

Check the specified input file and return the result.

Closes #4437
Merge pull request #4438 from andrsd/check-input

Adding --check-input command line option
Merge commit 'a8468bc883c2bdced79930fa5a864294193bd0a8'