kiji-express: EXP-415. Migrate Express to Scalding 0.9.0

issue: https://jira.kiji.org/browse/EXP-415
review: https://review.kiji.org/r/1652
commit: https://github.com/kijiproject/kiji-express/commit/b78bdc8b1f7c7e5408fd6715910b5a4ce91fffc5