Fixup memory leaks in moose unit
closes #3756
Merge pull request #3831 from permcody/fix_mem_leaks

Fixup memory leaks in moose unit
Adding documentation for contact heavy tests. Refs #3836.
Merge pull request #3838 from gambka/contact_tests_3836

Adding documentation for contact heavy tests. Refs #3836.
Merge commit '161c39fe0f2844d85f50e446ff974d7c5cef9197'
Merge commit '46a99c8b679f8c62e419c00be64a1011e0d1c6d2'