Add timer tolerance to improve battery life and app responsiveness
Add timer tolerance to improve battery life and app responsiveness

https://developer.apple.com/library/ios/documentation/Performance/Conceptual/EnergyGuide-iOS/MinimizeTimerUse.html

google/gtm-session-fetcher,google/gtm-session-fetcher,thomasvl/gtm-session-fetcher,google/gtm-session-fetcher,thomasvl/gtm-session-fetcher,thomasvl/gtm-session-fetcher