Relationship class compatibility fix

Author: technige

neo4j/v1/types.py

@@ -211,8 +211,6 @@ def hydrate(cls, id_, start, end, type, properties=None):
         return inst
 
     def __init__(self, start, end, type, properties=None, **kwproperties):
-        assert isinstance(start, int)
-        assert isinstance(end, int)
         super(Relationship, self).__init__(type, properties, **kwproperties)
         self.start = start
         self.end = end
@@ -221,6 +219,10 @@ def __repr__(self):
         return "<Relationship id=%r start=%r end=%r type=%r properties=%r>" % \
                (self.id, self.start, self.end, self.type, self.properties)
 
+    @property
+    def nodes(self):
+        return self.start, self.end
+
 
 class UnboundRelationship(BaseRelationship):
     """ Self-contained graph relationship without endpoints.