Remove old capistrano config.
Install Capistrano 3 gems.
Capify with capistrano3.
Set up basic capistrano config.
Install capistrano-postgresql for easier database setup.
Update to edge capistrano and capistrano-postgresql.

Released gems have problems on freebsd, using directly from git
until gems are updated.
Use updated capistrano-postgres.

Need this version to use correct database when checking/adding users
and databases.
Add config for staging setup.
Customize database.yml template.

We want to use unix domain sockets, not ip over localhost. For
this we simply drop the host specification of the yml-file.