Clean up Make targets

Resolves #83.

Makefile

-.PHONY: clone devstack.provision devstack.reset devstack.start devstack.stop help requirements update-images 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
-
+.DEFAULT_GOAL := help
 
+# Generates a help message. Borrowed from https://github.com/pydanny/cookiecutter-djangopackage.
 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}'
 
-clone: ## Clone service repos
-	./clone.sh
-
-devstack.destroy: ## Destroy all containers and volumes
-	./destroy.sh
-
-# TODO Print out help for this target. Even better if we can iterate over the services in docker-compose.yml, and
-# print the actual service names.
-devstack.open.%: ## Open a shell into the specified service container
-	docker exec -it edx.devstack.$* env TERM=$(TERM) /edx/app/$*/devstack.sh open
-
-devstack.open.lms: ## Open a shell into the LMS container
-	docker exec -it edx.devstack.lms env TERM=$(TERM) /edx/app/edxapp/devstack.sh open
+requirements: ## Install requirements
+	pip install -r requirements.txt
 
-devstack.open.studio: ## Open a shell into the Studio container
-	docker exec -it edx.devstack.studio env TERM=$(TERM) /edx/app/edxapp/devstack.sh open
+clone: ## Clone service repos to the parent directory
+	./clone.sh
 
-devstack.provision: ## Provision all services
+provision: ## Provision all services
 	./provision.sh
 
-devstack.reset: ## Remove all service containers
-	docker-compose down
-
-devstack.start: ## Start all services (with host volumes)
+up: ## Bring up all services with host volumes
 	docker-compose -f docker-compose.yml -f docker-compose-host.yml up
 
-devstack.start.sync: ## Start all services (with docker-sync)
+up-sync: ## Bring up all services with docker-sync
 	docker-sync-stack start
 
-devstack.stop: ## Stop all services
+stop: ## Stop all services
 	docker-compose stop
 
-requirements: ## Install requirements
-	pip install -r requirements.txt
+down: ## Remove all service containers and networks
+	docker-compose down
+
+destroy: ## Remove all devstack-related containers, networks, and volumes
+	./destroy.sh
 
-update-images: ## Update the Docker images
+pull: ## Update Docker images
 	docker-compose pull
 
 validate: ## Validate the devstack configuration
 	docker-compose config
+
+backup: ## Write all data volumes to the 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 $$(pwd)/.dev/backups:/backup debian:jessie tar zcvf /backup/elasticsearch.tar.gz /usr/share/elasticsearch/data
+
+restore:  ## Restore all data volumes from the host. WARNING: THIS WILL OVERWRITE ALL EXISTING DATA!
+	docker run --rm --volumes-from edx.devstack.mysql -v $$(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
+
+# TODO: Print out help for this target. Even better if we can iterate over the
+# services in docker-compose.yml, and print the actual service names.
+%-shell: ## Run a shell on the specified service container
+	docker exec -it edx.devstack.$* env TERM=$(TERM) /edx/app/$*/devstack.sh open
+
+lms-shell: ## Run a shell on the LMS container
+	docker exec -it edx.devstack.lms env TERM=$(TERM) /edx/app/edxapp/devstack.sh open
+
+studio-shell: ## Run a shell on the Studio container
+	docker exec -it edx.devstack.studio env TERM=$(TERM) /edx/app/edxapp/devstack.sh open