Add make json-schema.tar.gz command

Author: awwright

Makefile

@@ -14,7 +14,14 @@ all: $(OUT)
 %.html: %.xml
 	$(XML2RFC) --html $< -o $@
 
+json-schema.tar.gz: $(OUT)
+	mkdir json-schema
+	git clone . json-schema
+	(cd json-schema && make)
+	tar -czf json-schema.tar.gz --exclude '.*' json-schema
+	rm -rf json-schema
+
 clean:
-	rm -f $(OUT)
+	rm -f $(OUT) json-schema.tar.gz
 
 .PHONY: clean