MP Survey QuestionVC: Remove iOS 7 only warning
Use IFA only if AdSupport framework is compiled in the app
setValue does nothing if IFA doesn't exist
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Merge pull request #111 from mixpanel/ifa-changes

Use IFA only if AdSupport framework is compiled in the app
Merge pull request #92 from Threadflip/ios7-only

MP Survey QuestionVC: Remove iOS 7 only warning
Import UIKit due to assumption about PCH file