ENH: Added support for supplying patsy models to HDDMRegression.
BLD: Only run some tests on travis.
ENH: Added patsy support for HDDMRegression.
BLD: Added patsy to travis.
BUG: Did not specify knode_regress.
BUG: Missing cdfdif.c
BUG: Missing cdfdif.c
ENH: Support for multiple regressors. DPR: Removed old regression spec mechanism. TST: Adapted unittests.
DOC: Added docstring for HDDMRegression model.
TST: Renamed regressor unittests. Added z include unittest.
ENH: HDDMRegressor now only requires string including affected parameter.
STY: cython files.