[COOK-3851] Allow config file change notification    type to be specified by attribute, defaulting to :restart

Signed-off-by: Sean OMeara <someara@opscode.com>
[COOK-3611]Remove server bits and just install libpq-dev

Signed-off-by: Sean OMeara <someara@opscode.com>
[COOK-2954] Support Installing non-standard versions on CentOS 6

Signed-off-by: Sean OMeara <someara@opscode.com>