Add staging and production databases

No longer using RDS due to full text search issues
Correct usage of tar to untar ruby and gdal sources

-C actually changes directory, not uses it, so we have to first create
the directory.
Updates bucket size for nginx name config

Amazon EC2's crazy long domains break this otherwise
Update docs about DB instances

We're moving off RDS because it doesn't work with full text search
correctly (we have had issues with it not searching for text with
diacritic characters)
Merge pull request #47 from unepwcmc/new-db-servers

Ansible config for new db servers