Getting started steps give DB password failed error

[rawlingsj]

Following the guide https://github.com/spajus/hubot-control#running-with-docker gives error as below..

➜  ~  docker run --name hubot-control-db -d -e USER="docker" -e DB="hubot_control" -e PASS="docker" paintedfox/postgresql
fb456f783cd7acc25a651bf8d722b395c65facc8969aa7687a2ea4fa75b3e0dd
➜  ~  docker run --name hubot-control-data -v /usr/src/hubot-control/hubots busybox
➜  ~  docker run --rm --link hubot-control-db:db -e RAILS_DB_USERNAME="docker" -e RAILS_DB_PASSWORD="docker" hackedu/hubot-control bundle exec rake db:migrate RAILS_ENV=production
Your Gemfile lists the gem sqlite3 (>= 0) more than once.
You should probably keep only one of them.
While it's not a problem now, it could cause errors if you change the version of just one of them later.
rake aborted!
PG::ConnectionBad: FATAL:  password authentication failed for user "docker"
FATAL:  password authentication failed for user "docker"

Tasks: TOP => db:migrate

[spajus]

/cc @zachlatta

[zachlatta]

Submitted #14 to fix this.