Add postgres rake task

Signed-off-by: Sabha Parameswaran <sparameswaran@gopivotal.com>
Mark a test that broke as non_transactional

Signed-off-by: Sabha Parameswaran <sparameswaran@gopivotal.com>
Re-enable non_transactional for a spec that broke

Signed-off-by: Sabha Parameswaran <sparameswaran@gopivotal.com>