Initial port of the Arduino MQTT Client:

Dependents:   MQTTTest 2lemetryNXP MyTempuratureMqtt MqttClientEthInt ... more

remove unnecessary inclusion of EthernetInterface.h

There are situations where this lib could be used transport layers other than EthernetInterface. I'm in one of those situations right now. I've used the client to talk to the 2lemetry cloud (after removing the inclusion of EthernetInterface.h) and had no issues.

fork of, removed inclusion of EthernetInterface.h