use nose and add a simple test, if nose is installed

setup.py

@@ -33,6 +33,21 @@ def get_authors():
     return authors
 
 
+if "test" in sys.argv:
+    """
+    nose is a optional dependency, so test import
+    if user run with: './setup.py test'
+    """
+    try:
+        import nose
+    except ImportError as err:
+        print("Error: Can't import 'nose': %s" % err)
+        print("Maybe not installed or virtualenv not activated?!?")
+        print("e.g.:")
+        print("~your/env/$ source bin/activate")
+        print("~your/env/$ pip install nose")
+
+
 setup(
     name='python-creole',
     version=VERSION_STRING,
@@ -75,5 +90,5 @@ def get_authors():
         "Topic :: Text Processing :: Markup :: HTML",
         "Topic :: Utilities",
     ],
-    test_suite="creole.tests.get_test_suite",
+    test_suite="nose.collector",
 )