kiji-model-repository: KIJIREPO-36. Update dependency on scoring to released 0.7.0.

issue: https://jira.kiji.org/browse/KIJIREPO-36
review: https://review.kiji.org/r/1272
commit: https://github.com/kijiproject/kiji-model-repository/commit/71d257f5c74bbd968b529677692558f79db221ef