Updating README
Merge branch 'dovecot-14.04' of github.com:jprjr/docker-ubuntu-stack into dovecot-14.04
Merge branch 'dovecot-14.04' of github.com:jprjr/docker-ubuntu-stack into dovecot-14.04
Merge branch 'dovecot-14.04' of github.com:jprjr/docker-ubuntu-stack into dovecot-14.04