Allow configuration of app name for make setup.  (Use APP=...)

Change-Id: I068832a578bb12c18f5c1d582fd4e6ba98251397
diff --git a/Makefile b/Makefile
index 824ad31..dc03d97 100644
--- a/Makefile
+++ b/Makefile
@@ -74,8 +74,9 @@
 	echo now re-run 'make setup'
 
 # setup target sets up the basics of the development environment
+setup: APP=local-devel
 setup: initial-setup buildout
-	bin/gen-app-yaml -f local-devel
+	bin/gen-app-yaml -f $(APP)
 	bin/paver build --skip-pylint --skip-docs
 
 # force all setup dependencies to run again