[COOK-3717] Pgdg repositories improvements

Signed-off-by: Sean OMeara <someara@opscode.com>
[COOK-3756] Change postgresql.conf mode from 0600 to 0644

Signed-off-by: Sean OMeara <someara@opscode.com>
Version bump to v3.2.0
Version bump to v3.2.1
Merge branch 'master' of github.com:opscode-cookbooks/postgresql