Revert "Upgrade Travis environment to xcode8.2"
Revert "Upgrade Travis environment to xcode8.2"

This reverts commit 15ec5d7e2e3b66d53c2246d910930f6c3a8dae1a.

simonracz/detox,simonracz/detox,simonracz/detox,simonracz/detox,simonracz/detox