Added postgres module

Can't test though, because issues with ruby at the moment

Signed-off-by: Ippoippo <ippoippo-software@ippoippo-eco.com>
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Problems with ruby were actually down to issues with ruby-lang.org.

Been trying to get puppet working with postgres, but no luck

Signed-off-by: Ippoippo <ippoippo-software@ippoippo-eco.com>