Add 3 new unit tests for arima_process: arma_acovf, arma_acf, arma_generate_sample
Updated summary for OLS
Cleaned up division by using np.divide)
Added test for rsquared_adj and fixed parentheses error in actual function.
Test file passes pyflakes now.
Catching warnings
Merge pull request #919 from guyrt/ols-summary-crash

Ols summary crash with k_vars > nobs closes #868
ENH: support basinhopping solver in LikelihoodModel.fit()

- new _fit_mle_basinhopping()
- minimizer kwargs can be passed using 'minimizer' kwarg of dict type
DOC: clearer minimal example
DOC: review
DOC: minimal example text
minimial example formulas
DOC: min ex review
Merge pull request #927 from vincentarelbundock/minimal_example

DOC: clearer minimal example
base converged flag on res.message in _fit_mle_basinhopping()
use of score and hess arguments in _fit_mle_basinhopping()
update docstring of LikelihoodModel.fit()
TST: new TestProbitBasinhopping
add *args to _check_perfect_pred()
TST: remove no-op callback in TestProbitBasinhopping.setupClass()