Added admin_ip config option that when set provides a pg_hba.conf host entry for the given IP
changed admin_ip default to a zero length string
changed to work with a list of admin IP addresses rather than just a single address
merging lp:~richard-asbridge/charms/precise/postgresql/postgresql-admin-ip as per https://code.launchpad.net/~richard-asbridge/charms/precise/postgresql/postgresql-admin-ip/+merge/184789