kiji-express: EXP-158. Remove ScoreProducerJobTool.scala in org.kiji.express.tool

issue: https://jira.kiji.org/browse/EXP-158
review: https://review.kiji.org/r/1376
commit: https://github.com/kijiproject/kiji-express/commit/52beca276270c1d428081577cba23210bec3d942