Bump minimum PostgreSQL version to 8.4 in RPM and DEB packaging.
Squashed commit of the following:

commit 7ce60d8823e10f471c2864e12fe0c2f2998ede20
Merge: de43273 61249fe
Author: Jeff Gehlbach <jeffg@opennms.org>
Date:   Fri Apr 4 10:41:01 2014 -0400

    Merge branch 'master' of github.com:OpenNMS/opennms into experiment-postgres-min-84

commit de4327372ffaf4c964fcfc7bfaff3f90486b5f77
Merge: ef37d20 4219a10
Author: Jeff Gehlbach <jeffg@opennms.org>
Date:   Tue Apr 1 16:46:56 2014 -0400

    Merge branch 'master' of github.com:OpenNMS/opennms into experiment-postgres-min-84

commit ef37d2099b03e324c94cf37b27b2cdefba25c8c8
Author: Jeff Gehlbach <jeffg@opennms.org>
Date:   Tue Mar 25 14:40:18 2014 -0400

    Bump minimum PostgreSQL version to 8.4 in RPM and DEB packaging