Update README

I don't have psql installed on my host, and since it's already provided in the postgresql container, I modified the psql request to reference that one.
Merge pull request #114 from johnjelinek/patch-1

Update README to reference psql in postgresql container
readme: use the --format command line argument to fetch the container ip address
restore the changes from commit fbdb5ecbc9c560fa04ee570c04024efd11ccb343
readme: reference mysql command from mysql container
update to the sameersbn/ubuntu:14.04.20140812 baseimag
Fix #123 Set UseDNS to No in sshd_config
Merge pull request #124 from johnjelinek/patch-2

Fix #123 Set UseDNS to No in sshd_config
update to gitlab-shell 1.9.7
added support for redmine issue tracker
added support for jira issue tracker
Merge branch 'feature/third-party-trackers', Refer #107
added support for google apps oauth, refer #111
added twitter oauth configuration support
added github oauth configuration support
added OAUTH_ALLOW_SSO configuration option
added OAUTH_BLOCK_AUTO_CREATED_USERS configuration option
Merge branch 'feature/oauth-support'
readme: document JIRA_URL option in the "Available Configuration Options" section
disable UsePrivilegeSeparation in sshd configuration, fixes #122