Commented out cached expression logic
testing with test_evalexpr
Use numpy equivalent of functions from math if possible.
Simplified complex_step, finite_step and is_complex_stepable
code for evaluating gradients of arrays works. Needs to be tested.
Finished test for evaluate_gradient
Merge branch 'dev' of https://github.com/OpenMDAO/OpenMDAO-Framework into complex_step
Improved test coverage of derivatives code. Fixed _is_complex_stepable
Merge branch 'dev' of https://github.com/OpenMDAO/OpenMDAO-Framework into complex_step
Found test_scaler_array_array_expression_issue
Fixed evaluate_gradient with ndarrays of integers.
fixes
Merge pull request #1625 from Kenneth-T-Moore/complex_step

Cal's Complex step story