Javadoc and rename refactorings for Philips hue binding

Signed-off-by: Oliver Libutzki <o.libutzki@external.telekom.de>
Usage auf ThingUID in DiscoveryService
Fixed hue binding tests

Signed-off-by: Oliver Libutzki <o.libutzki@external.telekom.de>
Added gson as a dependency instead of including the jar file

Signed-off-by: Oliver Libutzki <o.libutzki@external.telekom.de>
Rename refactoring

Signed-off-by: Oliver Libutzki <o.libutzki@external.telekom.de>