BLD: Check for patsy dependency at build time + docs
Merge pull request #732 from jseabold/patsy-dependency

BLD: Check for patsy dependency at build time + docs. Closes #588 and #549.
Replacements, fixing LaTeX symbols representation
Fix LaTeX output: split in as many "tabular" environments as needed
DOC: Remove outdated note in docstring
Merge pull request #739 from jseabold/stata-doc-fix

DOC: Remove outdated note in docstring
Remove reference to new_t_test and new_f_test.
Merge pull request #748 from TomAugspurger/docfix

Remove reference to new_t_test and new_f_test.
DOC: Endog should be 2d.
ENH: Raise on single variable
Merge pull request #750 from jseabold/var-error-msg

VAR with 1d array.
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