Integrate Zope 3-based exception views. Patch by Sidnei, integration

work done for Infrae.

__init__.py

@@ -20,17 +20,22 @@
 
 from unauthorized import Unauthorized
 
+from zope.interface import implements
+from zope.interface.common.interfaces import IException
+from zope.publisher.interfaces import INotFound
+from zope.security.interfaces import IForbidden
+
 class BadRequest(Exception):
-    pass
+    implements(IException)
 
 class InternalError(Exception):
-    pass
+    implements(IException)
 
 class NotFound(Exception):
-    pass
+    implements(INotFound)
 
 class Forbidden(Exception):
-    pass
+    implements(IForbidden)
 
 class MethodNotAllowed(Exception):
     pass

unauthorized.py

@@ -15,9 +15,13 @@
 """
 
 from types import StringType
+from zope.interface import implements
+from zope.security.interfaces import IUnauthorized
 
 class Unauthorized(Exception):
-    """Some user wasn't allowed to access a resource"""
+    """Some user wasn't allowed to access a resource
+    """
+    implements(IUnauthorized)
 
     def __init__(self, message=None, value=None, needed=None, name=None, **kw):
         """Possible signatures: