Summary:
We're still having travis issues. In other projects, I have issues with iOS 8 timeouts, but nothing else that we've seen here (`pod lint` problems, iOS 9 and 10 timeouts).
Theory: the *simulator* is the problem?
Using `iPhone 6/s` seems to be passing consistently. (like [here](https://travis-ci.org/Instagram/IGListKit/builds/167933436)). So let's try always using this sim.
Closes https://github.com/Instagram/IGListKit/pull/72
Differential Revision: D4044243
Pulled By: jessesquires
fbshipit-source-id: 74921a97a056b713f1872b455609ef6df27a0690
