[Delivers #43555165 #47573637]Purge CDN Object functionality.Move CloudIdentity parameter to the end of all IObjectStoreProvider methods and make it nullable
Merge pull request #36 from kravi/PurgeCDNObject

[Delivers #43555165 #47573637]Purge CDN Object functionality.Move CloudIdentity parameter to the end of all IObjectStoreProvider methods and make it nullable