fixes test asserts that are failing because of changes in pandas master, and numpy.testing.assert_equal doesn't work anymore.
this adds a statsmodels.tools.testing module with an assert_equal wrapper for the corresponding numpy and pandas functions.
changes 1 test in test_arima so that desired is an Index not a list of strings.
statsmodels.tools.testing is currently used only for one case, namely to have backwards compatibility with assert_index_equal and assert_equal for older pandas
ENH: add tools.testing module for asserts (numpy, pandas compat wrapper)
TST: pandas compat: change asserts (failing with pandas master for 0.15)
@jseabold Do you want to have a look here? this is usually your area.
I tested it locally with pandas master, and it should remove the last test failures with pandas master in the pythonxy Ubuntu testing.
Coverage decreased (-0.0%) when pulling 461e926 on josef-pkt:BUG_pandas_compat_asserts into eeb1d97 on statsmodels:master.
merging to get Ubuntu test results
TST: fix assert_equal for pandas index, (was left out of PR #1887)