docker build --rm

[TJM]

The README for several of the images says to use docker build -rm ... but it needs to be docker build --rm

$ grep -r "docker build -rm" .
./couchdb/centos6/README.md:# docker build -rm -t <username>/couchdb:centos6 .
./couchdb/centos7/README.md:# docker build -rm -t <username>/couchdb:centos7 .
./Django/centos6/README.md:\# docker build -rm -t <username>/django:centos6 .
./Django/centos7/README.md:\# docker build -rm -t <username>/django:centos7 .
./firefox/centos6/README.md:# docker build -rm -t <username>/firefox:centos6 .
./firefox/centos7/README.md:# docker build -rm -t <username>/firefox:centos7 .
./httpd/centos6/README.md:# docker build -rm -t <username>/httpd:centos6 .
./memcached/centos6/README.md:    # docker build -rm -t <username>/memcached:centos6 .
./memcached/centos7/README.md:    # docker build -rm -t <username>/memcached:centos7 .
./mongodb/centos6/README.md:    # docker build -rm -t <username>/mongo:centos6 .
./mongodb/centos7/README.md:    # docker build -rm -t <username>/mongo:centos7 .
./mysql/centos6/README.md:    # docker build -rm -t <yourname>/mysql:centos6 .
./nginx/centos6/README.md:    # docker build -rm -t <username>/nginx:centos6 .
./nodejs/centos6/README.md:    # docker build -rm -t <username>/nodejs:centos6 .
./postgres/centos6/README.md:    # docker build -rm -t username/postgresql:centos6 . |& tee postgres_build.log
./python/centos6/README.md:    # docker build -rm -t <username>/python:centos6 .
./python/centos7/README.md:    # docker build -rm -t <username>/python:centos7 .
./qpid/centos6/README.md:    # docker build -rm -t qpidd:centos6 .
./qpid/centos7/README.md:    # docker build -rm -t qpidd:centos7 .
./rabbitmq/centos6/README.md:	# docker build -rm -t <username>/rabbitmq:centos6 .
./rabbitmq/centos7/README.md:	# docker build -rm -t <username>/rabbitmq:centos7 .
./redis/centos6/README.md:	# docker build -rm -t <username>/redis:centos6 .
./redis/centos7/README.md:	# docker build -rm -t <username>/redis-28-centos7 .
./registry/centos6/README.md:	# docker build -rm -t <yourname>/registry:centos6 .
./registry/centos7/README.md:	# docker build -rm -t <yourname>/registry:centos7 .
./ssh/centos6/README.md:	# docker build -rm -t <username>/ssh:centos6 .
./wordpress/centos6/README.md:# docker build -rm -t <yourname>/wordpress:centos6 .