TEST: add pz1 test
TEST: Add pz_spice test.
TEST: remove useless files.
Merge branch 'master' of https://github.com/ahkab/ahkab into tests
Merge branch 'master' of https://github.com/ahkab/ahkab into tests
Update test pz1: add .OP
TEST: update test pz_spice: add OP, skip butterworth on Travis.
Merge branch 'master' of https://github.com/ahkab/ahkab into tests
Merge branch 'master' of https://github.com/ahkab/ahkab into tests
Merge branch 'master' of https://github.com/ahkab/ahkab into tests
TEST: add m-2m EKV ladder test.
TEST: add tran1, test all tran methods.
Merge branch 'master' of https://github.com/ahkab/ahkab into tests
Merge branch 'master' of https://github.com/ahkab/ahkab into tests
Merge branch 'master' of https://github.com/ahkab/ahkab into tests
TEST: add test for BFPSS