set the postgresql node attributes manually

Crowbar (esp. migrations) doesn't allow us to have custom namespaces at
the same level as the current cookbook. So we need to hack this in the
recipe.

Fixes https://bugzilla.novell.com/show_bug.cgi?id=882225
Merge pull request #95 from mapleoin/postgresql-attr

set the postgresql node attributes manually
add travis testing support
Merge pull request #96 from dirkmueller/master

add travis testing support