TST: genmod test_link, change precision to allclose
STY/TST: families test_link, convert tests to test_function
Merge pull request #1404 from josef-pkt/TST_fix_genmod_link_tests

TST fix genmod link tests
MAINT: Fix path.
MAINT: E-mail the whole traceback.
Merge pull request #1406 from statsmodels/tools-fixes

MAINT: Tools improvements
Merge pull request #1387 from jseabold/fix-tests

MAINT: Fix failing tests
REF: Expose missing data handling as classmethod
STY: Expose handle_missing as a public method.
ENH: Higher level handle_missing function.
TST: Test handle_missing function
Merge pull request #1402 from jseabold/handle-missing-classmethod

REF/ENH: Expose missing data handling as function.
TST: Test handle_missing none keyword
ENH: Handle missing none keyword.
Merge pull request #1410 from jseabold/handle-missing-fix

ENH: Handle missing is none
TST temporarily rename tests probplot other to skip them
ENH: Make handle_data overwritable by subclasses.
Merge pull request #1416 from jseabold/handle-data-subclass

ENH: Make handle_data overwritable by subclasses.
TST: NormExpan sandbox.distributions: add basic unittests
BUG: NormExpan sandbox.distributions, no shape parameter see #1397