2.0.0

Fix: #53 Pass CDAClient.Builder to a private constructor
Fix: #51 Remove HTTP Response Object From CDACallback.onSuccess()
Fix: #49 Sync Generates New Executor For Every Callback Invoked
Fix: #47 Asynchronous Methods Should Defer Synchronous Methods
Fix: #44 Unify the API with the CMA SDK
New: #48 Support RxJava For Client Methods
New: #46 Support Custom API EndPoint
New: #45 Support Custom Callback Executor
New: #50 Kotlin Test Suite