added yaml as dev_dependencies for testing pubspec generation
added non-generated tests (expect_test_basic_class.dart)
ensure if introduction or purpose is provided README.md is generated
adding more tests to test_basic_class.dart
fixed nonJsonableTypes to include double, bool, and dynamic
fixed gen of newly created file to use writeAsStringSync so file is closed when done
added imoprt of ebisu_utils when jsonSupport specified
fixed fromJson when map or list of unspecified type to assume data is already jsonable
expanded tests on expect_test_basic_class.dart
added call to delete temp test folder in destroyTempData