[Rakefile] Force build Xcodeproj native extensions on Travis
[Rakefile] Force build Xcodeproj native extensions on Travis

ashfurrow/CocoaPods,vivekshukla-mob-ibtech/Repository,segiddins/CocoaPods,Ashton-W/CocoaPods,mglidden/CocoaPods,mglidden/CocoaPods,mglidden/CocoaPods