Merge into master from pull request #68:

...floodlightcontroller/core/web/JacksonCustomConverter.java

.../web/serializers/DeviceAttachmentPointJSONSerializer.java

...controller/core/web/serializers/DeviceJSONSerializer.java

...e/web/serializers/DeviceNetworkAddressJSONSerializer.java

...tcontroller/devicemanager/internal/DeviceManagerImpl.java

...ller/devicemanager/internal/DeviceManagerWebRoutable.java

...ightcontroller/devicemanager/internal/DeviceResource.java

src/main/java/net/floodlightcontroller/packet/Ethernet.java

src/main/java/org/openflow/util/HexString.java