ENH: convert the cryptically named scipy.special information theory functions into ufuncs
TST: add negative values to scipy.special information theory function tests
DOC: improve scipy.special information theory ufunc docstrings
MAINT: add .pxd files
MAINT: simplify kl_div
MAINT: combine multiple ufuncs into the same .pxd file
ENH: add huber loss function to the collection of convexity-related ufuncs
PEP8: pacify the pep8 overseer
ENH: add pseudo-huber loss function ufunc
Merge pull request #3981 from argriffing/infotheory-ufuncs

turn the cryptically named scipy.special information theory functions into ufuncs