fix for test from assumed_default change to float
added default_value to passthrough trait metadata
framework_var for gradient option
some small cleanups and a couple of new tests
merged out from dev
small fix to an input_as_output test
Merge branch 'dev' of https://github.com/OpenMDAO/OpenMDAO-Framework into vartree_asmb_boundary
todays work
Merge pull request #1635 from crobinsonut/dev

Fixed vartree framework variables
assumed default in int and enum
backed out some changed to driver from another branch
Added variable names to invalid variable error for constraints.
stuff
some progress
Merge branch 'dev' of https://github.com/OpenMDAO/OpenMDAO-Framework into bench
some fixes
Merge pull request #1636 from Kenneth-T-Moore/bench

Some fixes for NREL modeling
Merge branch 'dev' of github.com:OpenMDAO/OpenMDAO-Framework into vtree_successors
added assumed_default to bool
another fix