Bug glm NegativeBinomial fix for #2037 #2487
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Bug glm NegativeBinomial fix for #2037
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closes #2037
NegativeBinomial
resid_dev has nan if endog = 0
avoid integer alpha (I'm on python 3.4 and don't see integer division)
this doesn't add unit tests, we need a proper NegativeBinomial test case with zeros in endog