FEATURE: Add a sample 'links' key in a yaml configuration file to illustrate linking containers support.
Remove a duplicated listen_addresses="*" postgres configuration.
FIX: Install pg extention in the template1 database to avoid giving user superuser permissions, so db:migrate won't be failed.
FEATURE: Add support for laucher to read links key from yaml to link containers.
Merge pull request #95 from zdk/master

Support linking containers via containers yaml config