v0.7.8

• #60: Terratest now supports the function test_structure.IsTestDataPresent() that you can use to easily test whether any local test data has been saved using test_structure.SaveTestData(). This is useful when writing validation tests that should only be run in live clusters.

• UPDATE: We now prefer the use of test_structure.SkipStageEnvVarSet(), which is a simpler method for validating whether we're in an "integration test" environment or "unit test" environment.