changed ndepgraph to depgraph
Assembly.check_gradient is working
added get_constraints methods to HasEqConstraints and HasIneqConstraints
more cleanup for geometry example
test added for vartree arrays. Commented out for now.
Merge pull request #1485 from Kenneth-T-Moore/vartree

More small stuff
interim
Merge branch 'check_gradient' of github.com:naylor-b/OpenMDAO-Framework into check_gradient
Merge branch 'dev' of github.com:OpenMDAO/OpenMDAO-Framework into check_gradient
Fix for Bret: prevent fake edges from being lost in solve
Merge branch 'check_gradient' of https://github.com/Kenneth-T-Moore/OpenMDAO-Framework into check_gradient
add ken's fix to matvecREV
added a test
Merge pull request #1486 from naylor-b/check_gradient

check_gradient added to Assembly