[setup.py] add 'test_suite' to enable python setup.py test

also, add test *.glif files to package_data, so users can run test modules against the installed cu2qu by doing e.g.:

```
python -m cu2qu.test.pens_test
```

setup.py

@@ -19,6 +19,10 @@ from setuptools import setup
 setup(
     name='cu2qu',
     version='1.0',
-    packages=['cu2qu'],
+    packages=['cu2qu', 'cu2qu.test'],
-    package_dir={'': 'Lib'}
+    package_dir={'': 'Lib'},
+    test_suite="cu2qu.test",
+    package_data={
+        'cu2qu.test': ['data/*/*.glif', 'data/*/*.plist'],
+    },
 )