ENH: Import adfuller into tsa namespace
Merge pull request #1360 from jseabold/import-adfuller

ENH: Import adfuller into tsa namespace
ENH: Attach mlefit to results not model.
Merge pull request #1361 from jseabold/arma-attach-mle_retvals

ENH: Attach mlefit to results not model.
BUG: Fix typo.
Merge pull request #1363 from jseabold/fix-typo

BUG: Fix typo.
ENH: Get rid of hard-coded lbfgs. Closes #988.
Merge pull request #1364 from jseabold/fix-988

ENH: Get rid of hard-coded lbfgs. Closes #988.
ENH: Make sure mle returns attach to results.
STY: Import and pep 8 cleanup
Merge pull request #1365 from jseabold/ar-pep8

STY: Import and pep 8 cleanup
Merge pull request #1367 from jseabold/ar-mle-settings

ENH: Make sure mle returns attach to results.
STY: Pep 8 cleanup
Merge pull request #1368 from jseabold/model-pep8

STY: Pep 8 cleanup
TST: Add tests for failing ARMA(0,0) case.
ENH: Add support for ARMA(0,0) models
Merge pull request #1370 from statsmodels/arima-order-0-0

ENH: Support ARMA(0,0) models.
STY: Pep-8 cleanup
Merge pull request #1369 from jseabold/arima-pep8

STY: Pep-8 cleanup
ENH: Import tsaplots into tsa namespace. Closes #1359.