Revert changes to Cantilever example that don't match expected output

It looks like these were accidentally committed in
cab17345517a5d219a648abbb5dd86b33c7c25f0.
LargeUnixailExtension example clean up

Revert changes from 693767c195de92b995470478038e043e6a90e63c, which
altered the example but not the expected results.
Fix finite elasticity simple shear example

- Move output into expected results directory to fix test
- Fix .gitignore
Merge pull request #83 from adamreeve/finite_elasticity_examples

Finite elasticity example fixes