BUG: Fix exog for arima predict
TST: Test ARMAX MLE model
ENH: Handle out-of-sample exog for MLE ARMA. Closes #625.
DOC: Make predict docs templated
DOC: Add technical documentation for ARMAX
TST: Loosen precision for test
BUG: Fix accidental deletion in super call
ENH: Guard against 1 observation 1d exog
STY: Remove outdated comment
BUG: Use lag polynomial in ARMAX predict
TST: Add failing test for ARIMA with I == 0
BUG: Black magic to allow ARIMA to return ARMA for d == 0. Closes #736.
STY: Cleanup unneeded code
REF: Numpy version compat
BUG: Fix 1-step forecast for ARIMA(0,q). Closes #657.
TST: Add smoke test for ARIMA(0,q) forecast.
TST: Failing test for exog_names with ARMAX
BUG: Do not drop exog names in ARMAX. Closes #626.
BUG: Fix case of exog_names = None
TST: Silence fit