Adding gtest to travis yml
Adding gtest to travis yml


Former-commit-id: f8391882b9864732dbf5392300e8f02febbff0a9
dpayne/cli-visualizer,jgkamat/cli-visualizer,jgkamat/cli-visualizer,jgkamat/cli-visualizer,jgkamat/cli-visualizer,dpayne/cli-visualizer,dpayne/cli-visualizer,dpayne/cli-visualizer