REF: GenericLikelihoodModel, better precision options for score see #432
TST: miscmodels test_poisson partial refactor, increase decimal
REF GenericLikelihoodModel add summary, attach attributes add test case
REF add miscmodels.api empty the __init__
REF iolib.summary endog_names and exog_names could be None
BUG fix exog_names in miscmodels poisson, more unit tests
DOC attempt to refactor pareto example, not working properly yet
DOC: update example_gmle notebook to new summary
BUG: fix import path afte miscmodel api.py addition
REF/ENH: add extra_params_names to GenericLikelihoodModel
REF/ENH add initialize and predict to TLinearModel, with tests
BUG/REF: TLinearModel failed with fix_df, include extra params in initialize
BUG: remove simplefilter left in after debugging
BUG discrete_margins pylint, wrong function name
REF GenericLikelihoodModel, more robust names, df_model, df_resid
    fix TArma model with regression test
Merge pull request #933 from josef-pkt/generic_miscmodels

Update and improve GenericlikelihoodModel and miscmodels