MQTT-Client-Framework 0.9.0

[FIX] Fix random crashes on core data persistence #314
[FIX] use_frameworks!
[FIX] Swift Tests output
[FIX] CONNACK return codes
[NEW] access publish data back messageDelivered is called? closes #296
[FIX] XCode 8.3.1 warnings and documentation
[NEW] MQTT v5 properties
[FIX] Reset PUBLISH/PUBREL command's deadline interval when connection closed #302
[NEW] initial version 5