fixed sqlalchemy session bug,

pylons_app/lib/base.py

@@ -1,19 +1,19 b''
 """The base Controller API
 
 Provides the BaseController class for subclassing.
 """
 from pylons.controllers import WSGIController
 from pylons.templating import render_mako as render
 from pylons_app.model import meta
 
 class BaseController(WSGIController):
 
     def __call__(self, environ, start_response):
         """Invoke the Controller"""
         # WSGIController.__call__ dispatches to the Controller method
         # the request is routed to. This routing information is
         # available in environ['pylons.routes_dict']
         try:
             return WSGIController.__call__(self, environ, start_response)
         finally:
-            pass
+            meta.Session.remove()