kiji-bento: BENTO-62. Fix KijiScoring and ScoringServer packaging.

issue: https://jira.kiji.org/browse/BENTO-62
review: https://review.kiji.org/r/1392
commit: https://github.com/kijiproject/kiji-bento/commit/95a3e0d29b098eca4763034975bd1d711879a3bb