Make AdjustIo a static class
Make AdjustIo a static class

Refactor and clean up

dannycxh/ios_sdk,pitchtarget/adjust-ios-sdk,Threadflip/adjust_ios_sdk,BlueCrystalLabs/ios_sdk,mseegers/ios_sdk,akolov/adjust,nicolas-brugneaux-sociomantic/ios_sdk,trademob/ios_sdk,yutmr/ios_sdk