s/Session/SessionManager by tomeu suggestion

src/sugar/session.py

@@ -23,7 +23,7 @@ class XSMPClient(_sugarext.SMClientXSMP):
     def __init__(self):
         _sugarext.SMClientXSMP.__init__(self)
 
-class Session(object):
+class SessionManager(object):
     def __init__(self):
         address = _sugarext.xsmp_init()
         os.environ['SESSION_MANAGER'] = address