ULib - This patch adds PostGres test alongside with minor fix

This patch adds PostGres test database alongside with minor fix...

All tests are passing as per [my Travis-CI build log](https://travis-ci.org/stefanocasazza/FrameworkBenchmarks/builds/45049685)
Question - can you tell me what this variable does? I've seen a few frameworks using it, but I can't seem to figure out what it's for