We don't know the production DB credentials (yet?)
Update fabfile with new staging and production servers settings
Rename task back to get_db_dump, but make dbname a required argument to give a clue that it's going to do something to your database
Address review comments plus general cleanup

* fix get_db_dump to use the specified DB name
* fix doc on get_db_dump
* fix env.root on production
* add better doc for get_media
* removed some unused things
Merge branch 'feature/40-separate-databases' into develop