ENH: Fix standard error cache issue.
ENH: Fix standard error for nb1
BUG: Pass editted and attached offset and exposure to super.
BUG: Fix subclass keywords. Offset and exposure are free.
TST: Fix failing tests.
ENH: Correctly handle alpha and alpha_std_err for nb1
DOC: Fix NegativeBinomial docstring
DOC: Clean up docs a bit.
DOC: Add NegativeBinomial to discrete.rst
DOC: Add docs to NB results class.
DOC: Add docs for Logit and Probit results
DOC: Fix inline math spacing. Require latex preview package.
STY: Pep-8
DOC: Fix whitespace issue
DOC: Clarify likelihoods.
STY: Calculate tri_indices oncce.
REF: Do everything in terms of alpha after fit. nb1 broken.
REF: Use complex step derivatives
STY: x**-1 -> 1/x
REF: Micro-optimization don't use self.