davepoon/docker helper function

## docker helper function
To clear containers:

docker rm -f $(docker ps -a -q)
To clear images:

docker rmi -f $(docker images -a -q)
To clear volumes:

docker volume rm $(docker volume ls -q)
To clear networks:

docker network rm $(docker network ls | tail -n+2 | awk '{if($2 !~ /bridge|none|host/){ print $1 }}')
	To clear containers:

	docker rm -f $(docker ps -a -q)
	To clear images:

	docker rmi -f $(docker images -a -q)
	To clear volumes:

	docker volume rm $(docker volume ls -q)
	To clear networks:

	docker network rm $(docker network ls \| tail -n+2 \| awk '{if($2 !~ /bridge\|none\|host/){ print $1 }}')