REF: Deprecate resid -> resid_dev
TST: Add residual results
TST: Add tests for new residuals
ENH: Add more residuals to binary discrete models
STY: Adjust comments.
TST: Add poisson residuals
ENH: Move resid to discrete and fix count resids
STY: Remove comment
TST: Add test for MNLogit resids
ENH: Fix MNLogit resids.
TST: Add mnlog resid results
TST: Remove windows skip test. Closes #594.
BUG: Clip at machine precision. Closes #670.
TST: Smoke test for response residuals
ENH: Add response residuals to binary discrete choice
DOC: Document residuals
REF: resid -> resid_misclassified in MNLogit
Merge pull request #752 from jseabold/discrete-cleanup

ENH: Discrete cleanup.