add rebuild_xos and rebuild_synchronizer targets
diff --git a/xos/configurations/devel/Makefile b/xos/configurations/devel/Makefile
index 19e9abd..b4f3fcf 100644
--- a/xos/configurations/devel/Makefile
+++ b/xos/configurations/devel/Makefile
@@ -36,3 +36,9 @@
 
 upgrade_pkgs:
 	sudo pip install httpie --upgrade
+
+rebuild_xos:
+	make -C ../../../containers/xos devel
+
+rebuild_synchronizer: 
+	make -C ../../../containers/synchronizer