Change old 'sliver' ref to instance
diff --git a/xos/helloworld/models.py b/xos/helloworld/models.py
index 37f6751..a657f3a 100644
--- a/xos/helloworld/models.py
+++ b/xos/helloworld/models.py
@@ -11,7 +11,7 @@
 
 class Hello(PlCoreBase):
     name = models.CharField(max_length=254,help_text="Salutation e.g. Hello or Bonjour")
-    sliver_backref = models.ForeignKey(Instance)
+    instance_backref = models.ForeignKey(Instance)
     
 class World(PlCoreBase):
     name = models.CharField(max_length=254,help_text="Name of planet")