Fixing typo to allow manager to switch between different index_labels

Author: MadanThangavelu

haystack/indexes.py

@@ -59,7 +59,7 @@ def __new__(cls, name, bases, attrs):
         # Assigning default 'objects' query manager if it does not already exist
         if not attrs.has_key('objects'):
             try:
-                attrs['objects'] = HaystackManager(attrs['meta'].index_label)
+                attrs['objects'] = HaystackManager(attrs['Meta'].index_label)
             except KeyError:
                 attrs['objects'] = HaystackManager(DEFAULT_ALIAS)