added gitignore to benchmarks dir
merged in justin's stuff
interim
Merge branch 'req_true_vtree' of github.com:naylor-b/OpenMDAO-Framework into req_true_vtree
added justin's test file
Merge branch 'req_true_vtree' of github.com:naylor-b/OpenMDAO-Framework into req_true_vtree
fixed issue with required=True and vartrees
Merge pull request #1619 from naylor-b/req_true_vtree

fixed issue with required=True for vartrees