Fix #22 --batch-size of reindex command for Django 1.7

Author: dethi

src/management/commands/algolia_reindex.py

@@ -19,5 +19,5 @@ def handle(self, *args, **options):
                 continue
 
             counts = adapter.reindex_all(
-                batch_size=options.get('batchsize', None))
+                batch_size=options.get('batchsize', 1000))
             self.stdout.write('\t* {} --> {}'.format(model.__name__, counts))