Fixes #88 - Add pull target which will work after destroy (#89)

* Fixes #88 - Add pull target which will work after destroy

* Update Readme to include new pull target

* Spelling error
diff --git a/docker-compose/Makefile b/docker-compose/Makefile
index 21e9a32..3dd1019 100644
--- a/docker-compose/Makefile
+++ b/docker-compose/Makefile
@@ -273,6 +273,10 @@
 	$(WSK_CLI) -i action delete hello-perf
 	rm hello.js
 
+.PHONY: pull
+pull: download setup
+	docker-compose --project-name openwhisk pull
+
 # Optional package configuration stages. These commands will install and set up
 # the alarms, cloudant and kakfa packages.
 PACKAGES = alarms cloudant kafka
diff --git a/docker-compose/README.md b/docker-compose/README.md
index 99f7362..19d7af5 100644
--- a/docker-compose/README.md
+++ b/docker-compose/README.md
@@ -146,6 +146,9 @@
 ```
 wsk package list /whisk.system
 ```
+## Updating Containers
+
+If you want to pull new containers you can use `make pull` to update all the containers used in the docker-compose file.
 
 ## Install Feed Providers