Merge pull request #278 from toddreifsteck/nh

Enhanced push client for iOS in Objective C
Merge pull request #285 from toddreifsteck/nh

Fix registrationId save which currently breaks unit tests
Update iOS SDK Minor Version
Update Changelog with 1.2.2 changes
E2ETests for Enhanced push Mobile Service now pass
Add enhanced push service tests
Add missing file to Enhanced push
Fix read of isNhEnabled to fix legacy push