scipy/scipy — pull request #3387 by hunse (2014-02-25 17:29:18+00:00)
Title: BUG: change value of expit for large inputs from nan to 1

As noted [on stackoverflow](http://stackoverflow.com/questions/22006650/scipy-expit-unexpected-behavour-nans), expit for large inputs returns nan, when it should return 1. With this fix, expit behaves as it should.