Declare ORKScrollToTopAnimationDuration and ORKCGFloatInvalidValue as extern in ORKHelpers.h; fixes #679
Declare ORKScrollToTopAnimationDuration and ORKCGFloatInvalidValue as extern in ORKHelpers.h; fixes #679

chb/ResearchKit,chb/ResearchKit,chb/ResearchKit,chb/ResearchKit