Automatically create new template details XML file

Makefile

@@ -19,7 +19,7 @@ npm:
 	cd slt; npm run sass
 
 .PHONY: slt.tar.gz
-slt.tar.gz: npm
+slt.tar.gz: npm slt/templateDetails.xml
 	# cd slt ; tar czf ../$@ *
 	tar czf $@ -C slt \
 		css/dynamic-styles.css.php css/index.html css/style.css css/.htaccess \
@@ -34,6 +34,10 @@ slt.tar.gz: npm
 		template_thumbnail.png \
 		templateDetails.xml
 
+.PHONY: slt/templateDetails.xml
+slt/templateDetails.xml:
+	./scripts/create-details-xml.sh
+
 .PHONY: release
 release: slt.tar.gz
 	./scripts/create-release.sh