Import correction for 2.7 version

Author: 0--key

tests/test_facade.py

@@ -28,7 +28,10 @@ def setUp(self):
 
     def test_bunch_launch(self):
         import sys
-        from io import StringIO
+        try:
+            from io import StringIO
+        except:
+            from StringIO import StringIO
         out = StringIO()
         sys.stdout = out
         self.runner.runAll()