GadgetKeeper integration test has been removed.

Now, it's unnecessary to keep GK integration test, it is already working!
Messages broker-based proxy has been implemented.

Main purpose of a proxy is a redeliver messages from one topic to another.

* extend behavior of a messages broker without complicated it's own code
* direct channel, for example, from ZigBee-based device to an MQTT device
Extract method behavior has been rebased into "util" module.

* avoid code duplication
* add reusable extract-method behavior to the "util"
Broker of the services can determine service key from simple message (instead of JSON-RPC).

Now, it's valid to call services in two forms: {"method":"myService",...}; myService, param0, param1,...

* simplify services calling stuff
* simplify services calling from "small" device
"Arduino blink responser" has been implemented.

Now, small devices can response to the "blink" request.
Set of a fixes.

"Arduino blink" service and broker of the services has been refactored, test of the broker has been refactored. Utils for log purposes has been implemented.
Set of fixes.
Log4j config has been implemented for main App.