Commits on Sep 22, 2017

1. Properly return postgres query errors on failure …

   When using the `query` method in the `postgres_session` resource, if
   the query fails, the `query` method attempts to call `skip_resource`
   with an error message. Not only does the `skip_resource` not properly
   work, but it also returns a `String` object back to the test which is
   probably going to try and call the `output` method on it to run the test.
   
   This results in an error like this:
   
   ```
     Can't read
        ∅  undefined method `output' for "output":String
   ```
   
   This change returns the full psql output as a Lines object to the
   user, including stderr, so they can at least get the error in their
   test output and avoids undefined method errors.
   
   Signed-off-by: Adam Leff <adam@leff.co>

   

   adamleff committed Sep 22, 2017
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