Added Make targets to backup and restore volumes

Makefile

 .PHONY: clone devstack.provision devstack.reset devstack.start devstack.stop help requirements validate
 
+backup-volumes: ## Backup all data volumes to the local host
+	docker run --rm --volumes-from edx.devstack.mysql -v $$(pwd)/.dev/backups:/backup debian:jessie tar zcvf /backup/mysql.tar.gz /var/lib/mysql
+	docker run --rm --volumes-from edx.devstack.mongo -v $$(pwd)/.dev/backups:/backup debian:jessie tar zcvf /backup/mongo.tar.gz /data/db
+	docker run --rm --volumes-from edx.devstack.elasticsearch -v $$(pwd)/.dev/backups:/backup debian:jessie tar zcvf /backup/elasticsearch.tar.gz /usr/share/elasticsearch/data
+
+restore-volumes:  ## WARNING: THIS WILL OVERWRITE ALL EXISTING DATA!!! Restore all data volumes from the local host.
+	docker run --rm --volumes-from edx.devstack.mysql -v $$(pwd)/.dev/backups:/backup debian:jessie tar zxvf /backup/mysql.tar.gz
+	docker run --rm --volumes-from edx.devstack.mongo -v $$(pwd)/.dev/backups:/backup debian:jessie tar zxvf /backup/mongo.tar.gz
+	docker run --rm --volumes-from edx.devstack.elasticsearch -v $$(pwd)/.dev/backups:/backup debian:jessie tar zxvf /backup/elasticsearch.tar.gz
+
+
 help: ## Display this help message
 	@echo "Please use \`make <target>' where <target> is one of"
 	@perl -nle'print $& if m{^[\.a-zA-Z_-]+:.*?## .*$$}' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m  %-25s\033[0m %s\n", $$1, $$2}'