Simple state for installing postgis for postgres 9.1

gistfile1.yml

psqldeps:
    pkg.installed:
        - pkgs:
            - libxslt-dev
            - python-software-properties
            - libpq-dev
    file.managed:
        - name: /etc/postgresql/9.1/main/pg_hba.conf
        - source: salt://pg_hba.conf
        - replace: True

postgresql-9.1-postgis:
    pkgrepo.managed:
        - ppa: ubuntugis/ppa
    pkg.installed:
        - refresh: True