jubatus/jubatus_core — pull request #1 by kumagi (2014-06-03 04:34:15+00:00)
Title: `delete_label` should return true when succeed to delete

fix [issue-800](https://github.com/jubatus/jubatus/issues/800)

I modified test to `local_storage` and `local_storage_mixture` and `stub_storage` do the same behavior.