Another round of pyflakes/pylint cleanup. This commit covers the emplike and formula modules.
Fixed pyflakes in genmod: only one import error fixed due to overwrite in pull request 915.
Fix a docstring in KDEMultivariateConditional.
Merge pull request #956 from dougalsutherland/kde-doc

Fix a docstring in KDEMultivariateConditional.
Merge pull request #951 from guyrt/pylint-emplike-formula-genmod

Pylint emplike formula genmod
BUG/REF mcnemar fix exact pvalue, allow table as input
BUG: mcnemar restrict pval<=1 see #950
TST: runs, cochran_q move tests from module
TST cochran_q add another test from an example
TST cochran_q another test case from an example
BUG add asarray to grangercausalitytests see #942
DOC: example for granger causality
DOC/STY cochran_q, mcnemar docstring and pep-8
REF rename cochran_q cochrans_q
ENH: add symmetry_bowker
ENH: mcnemar vectorized (future multiple comparison)
TST mcnemar test against R chisquare no correction
STY: some pylint cleanup, possible bug in runstest_2samp unsorted
BUG: runstest_2sample (also previous commit), add tests closes #963
REF/DOC update mcnemar docstring, drop exact='auto' option