kiji-scoring: SCORE-134. Reflect kiji-express package move.

issue: https://jira.kiji.org/browse/SCORE-134
review: https://review.kiji.org/r/1382
commit: https://github.com/kijiproject/kiji-scoring/commit/4fdb53ce49776bc0fc2d0b46bfb2dc7e6adddba1