Only process the SKETCH_* internal messages for nodes with childId == 255 to eliminate a nil exception being raised in the plug-in before a node is include.
The SKETCH_NAME & SKETCH_VERSION will only be set for non-nil childIds.  While this eliminates exceptions raised when an unincluded-node reports sketch information, it also means that the sketch information will not be processed by the gateway until the first node-restart after the node has been included by the gateway.  Also improved the processInternalCommand() logging of internal messages not recognized by the gateway to report the unrecognized message received from the node and the associated child id from the childIdLookupTablep[] and to log this information as a warning so they are immediately visible in the log (i.e. yellow).
Merge pull request #2 from bblacey/skinfo-bugfix

Only process the SKETCH_* internal messages for nodes with childId == 25...