added phpUnit base class for unit tests: GrowifyTest.php
added phpUnit base class for unit tests: GrowifyTest.php

DannyEaton/growify,DannyEaton/growify,rdicharry/growify-fork-20161209,rdicharry/growify-fork-20161209,DannyEaton/growify,rdicharry/growify-fork-20161209