add app target in Makefile

Makefile

@@ -18,6 +18,23 @@ dist: owncloud-collabora-online.spec info.xml
 	tar cfz owncloud-collabora-online-$(VERSION).tar.gz owncloud-collabora-online-$(VERSION)
 	rm -rf owncloud-collabora-online-$(VERSION)
 
+app: info.xml
+	rm -rf richdocuments
+	mkdir richdocuments
+	tar cf - --exclude appinfo/info.xml.in *.php \
+                appinfo \
+                assets \
+                controller \
+                css \
+                img \
+                js \
+                l10n \
+                lib \
+                templates \
+                | ( cd richdocuments && tar xf - )
+	zip -r richdocuments.zip richdocuments
+	rm -rf richdocuments
+
 owncloud-collabora-online.spec: owncloud-collabora-online.spec.in Makefile
 	sed -e 's/@PACKAGE_VERSION@/$(VERSION)/g' <owncloud-collabora-online.spec.in >owncloud-collabora-online.spec