Add rattail_config attribute to base View class.

Just a shortcut but should save a little code noise.

tailbone/views/core.py

@@ -38,6 +38,13 @@ class View(object):
     def __init__(self, request):
         self.request = request
 
+    @property
+    def rattail_config(self):
+        """
+        Reference to the effective Rattail config object.
+        """
+        return self.request.rattail_config
+
 
 def fake_error(request):
     """