kiji-scoring: SCORE-149. Fix Checkstyle and findbugs from SCORE-148

issue: https://jira.kiji.org/browse/SCORE-149
review: https://review.kiji.org/r/1569
over-the-shoulder-reviewers: clint
commit: https://github.com/kijiproject/kiji-scoring/commit/f1d78706bf269d14f99b858c7151fdb437240054