Fixed build error with new Testflight SDK
Fixed build error with new Testflight SDK

With the recent release of the Testflight SDK (2.2.3) 
+ (void)setDeviceIdentifier:(NSString *)deviceIdentifer
is no longer available.
Using a + (void)takeOff instead should be fine.
ftvs/ARAnalytics,AliSoftware/ARAnalytics,KBvsMJ/ARAnalytics,sgtsquiggs/ARAnalytics,skeeet/ARAnalytics,ed-at-work/ARAnalytics,indiegogo/ARAnalytics,sunfei/ARAnalytics,segiddins/ARAnalytics,rinatkhanov/ARAnalytics,levigroker/ARAnalytics,diogot/ARAnalytics,sp3esu/ARAnalytics,HelloZhu/ARAnalytics,BamX/ARAnalytics,arbesfeld/ARAnalytics,sodastsai/ARAnalytics,imclean/ARAnalytics,AlexanderBabchenko/ARAnalytics,wzs/ARAnalytics,Labgoo/ARAnalytics,orta/ARAnalytics,natan/ARAnalytics,modulexcite/ARAnalytics,ashfurrow/ARAnalytics,saidmarouf/ARAnalytics